Complete the following achievements to unlock Xbox Live Gamerscore points.
Prison Breakout (10 points): Completed tutorial level on any skill level.
Completed Act 1 on Casual (10 points): Complete Act 1 on Casual Difficulty.
Completed Act 2 on Casual (10 points): Complete Act 2 on Casual Difficulty
Completed Act 3 on Casual (10 points): Complete Act 3 on Casual Difficulty.
Completed Act 4 on Casual (10 points): Complete Act 4 on Casual Difficulty.
Completed Act 5 on Casual (10 points): Complete Act 5 on Casual Difficulty.
Mercenary (10 points): Complete all acts on Casual Difficulty.
Completed Act 1 on Hardcore (20 points): Complete Act 1 on Hardcore Difficulty.
Completed Act 2 on Hardcore (20 points): Complete Act 2 on Hardcore Difficulty.
Completed Act 3 on Hardcore (20 points): Complete Act 3 on Hardcore Difficulty.
Completed Act 4 on Hardcore (20 points): Complete Act 4 on Hardcore Difficulty.
Completed Act 5 on Hardcore (20 points): Complete Act 5 on Hardcore Difficulty.
Soldier (20 points): Complete all acts on Hardcore Difficulty.
Completed Act 1 on Insane (20 points): Complete Act 1 on Insane Difficulty.
Completed Act 2 on Insane (30 points): Complete Act 2 on Insane Difficulty.
Completed Act 3 on Insane (30 points): Complete Act 3 on Insane Difficulty.
Completed Act 4 on Insane (30 points): Complete Act 4 on Insane Difficulty.
Completed Act 5 on Insane (30 points): Complete Act 5 on Insane Difficulty.
Commando (30 points): Complete all acts on Insane Difficulty.
Time to Remember (10 points): Recover one-third of the COG tags (on any difficulty).
Honor-Bound (20 points): Recover two-thirds of the COG tags (on any difficulty).
For the Fallen (30 points): Recover all of the COG tags (on any difficulty).
My Love for You Is Like a Truck (30 points): Defeat a Berserker on Hardcore Difficulty.
Broken Fingers (30 points): Defeat a Corpser on Hardcore Difficulty.
A Dish Best Served Cold (30 points): Defeat General RAAM on Hardcore Difficulty.
Zen and the Art of Reloading (10 points): Perform 25 perfect active reloads (20on any difficulty).
Zen and the Art Part 2 (20 points): Perform 5 perfect active reloads in a row (20on any difficulty).
Clusterluck (20 points): Kill 3 enemies at once 10 different times (20on any difficulty).
A Series of Tubes (20 points): Host and complete 50 ranked matches.
Dom-curious (10 points): Complete 1 co-op chapter as Dominic Santiago on any difficulty.
Domination (20 points): Complete 10 different co-op chapters as Dominic Santiago on any difficulty.
I Can't Quit You Dom (30 points): Complete all acts in co-op as Dominic Santiago on any difficulty.
Don't You Die On Me (10 points): Revive 100 teammates in ranked matches.
Fall Down Go Boom (20 points): Kill 100 enemies in ranked matches with the Boomshot.
Pistolero (20 points): Kill 100 enemies in ranked matches with a pistol.
The Nuge (20 points): Kill 100 enemies in ranked matches with the Torque Bow.
I Spy with My Little Eye (20 points): Kill 100 enemies in ranked matches with the Longshot.
Don't Hurt 'Em (20 points): Kill 100 enemies in ranked matches with the Hammer of Dawn.
It's a Massacre (10 points): Kill 100 enemies in ranked matches with the Chainsaw.
Curb Appeal (20 points): Kill 100 enemies in ranked matches with the curb stomp.
Capital Punishment (20 points): Kill 100 enemies in ranked matches with an execution.
Is It A Spider (30 points): Kill 100 enemies in ranked matches with grenade tag.
The Money Shot (20 points): Kill 100 enemies in ranked matches with a headshot.
Always Remember Your First (10 points): Finish playing a versus ranked match.
Don't Hate the Player (10 points): Finish with the highest points in a ranked match.
Mix It Up (30 points): Win a ranked match in every versus game type.
Around the World (30 points): Win a ranked match on every versus map.
Can't Touch Me (20 points): Win 10 ranked matches without losing a round.
Seriously ... (50 points): Kill 10,000 people in versus ranked match total.
Successfully complete under the Casual or Hardcore difficulty setting.
Secret gamer picture:
Successfully complete the game under the Insane difficulty setting to unlock a secret gamer picture. It has the Red Gear's Symbol behind Marcus.
In the final level, you first need to get the Berserker's attention. Berserkers are blind. They only go off smell and sound. Lead her all the way back to the very first train car. While she is still on it, quickly run off and press the button to release the car. Have fun watching the train car collapse and have the Berserker go with it.
Boomers have rocket launchers and can usually kill you in one hit. In order to kill them safely, take cover and wait until they shoot at you before you start shooting back. Just as they start reloading is the best time to shoot them, because their gun has a very slow reload. After they reload, hide again and let them fire. Repeat this a few times to kill them.
Defeating General Raam:
When you get to General Raam at the end of the last Act, he will have a Gatlin type gun and is surrounded by the Bird Locust. There will also be flying Locusts attacking from the side of the train (ignore them). You can only damage General Raam when the Bird Locusts leaves him and goes for you. Stay in the light or the birds can kill you. When you start fighting him, hide behind the first rectangular block that is directly in front of the doors you came from. He will start walking towards you and shoot. When the birds leave him, start shooting. After a while he will get directly in front of where you are hiding. When he does, run around him and hide on the other side of the platform. Stay in the light as you run. Hide, then continue shooting him until he dies.
Get General Ramm off the Gatlin gun. When he starts walking towards you, let Dominic get his attention. Then, run towards the Gatlin gun and shoot him with it. This should kill him in seconds. This is easier in co-op mode.
If you have a difficult time accessing the second Troika-gun, try this specific gun-combo. At the level start, ensure that the Lancer Rifle and the Torque Bow are in your inventory. Collect the extra ammunition from the train car and enter the next area. When the intermission scene ends, proceed to the vault over the cement slab. Enter cover behind any of the cement blocks. You must hit Raam with the Torque Bow to drive off the Kryll. When they fly away, immediately switch to the Lancer Rifle to execute as many headshots as possible. This may require at least a clip of ammunition each time. When the Kryll regroup, reload the Lancer Rifle immediately, and switch to the Torque Bow. Depending on various timing-issues, Raam will advance to your location, requiring that you use the "switch cover" action to force Raam to adapt his path-finding. Whenever Raam's AI pauses to change direction, repeat the use of the Torque Bow/Lancer Rifle combination. This method may require at least five combos to defeat Raam. If you run out of Torque Bow arrows, the grenades may be used as a means of "scaring off" the Kryll.
Defeating the Corpser:
In Act 3, you are in the Locust tunnels and must plant the Resonater in the building behind a lava filled lake. There are rocks on top of the lava, allowing you to just walk across. However, it is not that easy. About one third of the way across an intermission sequence starts, with a giant spider creature, the Corpser. For this battle all you need is a shotgun and machine gun. This will be a fairly long range fight. It is an easy fight but Wretches that come from everywhere complicate it. When the Corpser raises all his legs and slams them down, most likely your teamate will yell "Wretches!". This is your cue to bring out a shotgun or use your machine gun. At the beginning you should have a point of interest on the stomach, which is your cue to shoot it. You can always get a shot on it, even when the Corpser shields itself; or you can wait till it try an attack then unload on its belly. After that there will be another point of interest, which is in its mouth. After you shoot the belly it cringes and its mouth opens as it screams. Shut it up by shooting the mouth. While you are doing this, watch out for the Corpser's Ground Pound. It not only brings Wretches (watch the ceiling), but also takes away part of the arena in the back. If your character dies in the back he might be lost. Your ammo cases may also be lost. Keep repeating the process of shooting the belly and the mouth full of lead until the Corpser backs up as far as it. It can no longer be hurt. There will now be a point of interest around the smashable latches. There are two of them. Shoot both of the latches so that they pop, and the platform that the Corpser is on will be sent into the lava.
In the Act named "Belly Of The Beast", there is a giant spider that you have to fight. It will hide itself behind its legs (which are bullet proof). In order to hurt it you must move to a location where you can shoot its belly. After a few shots it will move its legs and scream. You must now have to shoot it in the mouth, which will cause it to back up. After doing this a few times it should back up onto a metal platform that is over lava. There will be two hatches that are holding the platform up. You must stand on them until the spider tries to stomp on you. Just before it hits you, jump out of the way. It will hit the hatch instead of you. This will begin breaking the hatches. Doing this a few times on both hatches should break them and kill the spider. Note: Doing this under the Hardcore difficulty will earn you an achievement. Also, there will be Wretches that will attack you while you fight the spider. Be sure to kill them before they kill you.
When an emergence hole opens up, toss a grenade into it. This will automatically close the hole, and therefore keep the Locusts from coming out.
Finding C.O.G. tags:
When playing campaign mode, look for the dead soldier symbol (red gear with skull inside) painted on a wall, floor, or other location. This indicates that the Locust have killed some Gear soldiers in the area. Because Gear soldiers wear C.O.G. Tags, you should be able to find one nearby.
Hint: Act 2: C.O.G. tag location:
When you reach the part with the spotlight, instead of going straight, go to the left. You should find a cog tag there.
Faster reload times:
In order to reload, press RB. There will now be a clear bar with a small white segment somewhere along it. It will appear where your bullets used to be. There will also be a smaller white bar moving across the clear bar. As soon as the white bare gets inside the white segment, press RB again. This will make you reload much faster, and if timed just perfectly can give your gun an extra boost in fire power. However if you do not time it correctly, the clear bar will become red and it will take even longer to reload than if you had not attempted it.