COG tags are the future's equivalent of dogtags. They are hidden throughout the game and can be picked up in various chapters of every act. You will notice them by their illuminated blue glow. If you have picked up a COG tag in a certain area, and are playing through the game again, you will not be able to pick that COG tag up again. The number of COGs you have picked up can be seen in the pause menu.

Notes:

• For a list of all COG tags, click here.
• If you are playing in Co-op, you will be able to see a COG tag you have already picked up provided your partner has not done so. However, you will not be able to pick it up.
• The cog tags can be picked up in Co-op. However, only one player can pick up any given tag.

You will find the Berserker in 'China Town', the final chapter of Act 1. Lead her through the house by standing in the doorway you want her to go through, shooting her, then jumping out of the way right before she hits you. Repeat until you lead her outside, then use the Hammer of Dawn on her. Hit her with it twice to obtain the achievement.

You will find the Corpser in 'Angry Titan', the final chapter of Act 3. To defeat it, stand near it. It will raise a leg to attempt to hit you. Once it does that, shoot it in the stomach. It will rear back, exposing its entire body. Hit it in the neck, and it will retreat. Do this three times in a row to make it go onto a platform. Then, pull out your Gnasher (shotgun) and hit the two clasps on either side. If you don't have a shotgun, you will need to use another gun or grenades, but the Gnasher is ideal.

General RAAM will attack you in 'Pale Horse', the last chapter of the game. It is recommended you do this with a partner, as it's very tough otherwise.

I personally hid behind the first wall and unloaded my Longshot into his head until he got too close. When he did, I jumped over the wall and high-tailed it to the other side of the train for cover. Then I started unleashing some more headshots until he went down.

Killing 3 enemies at one time will require a grenade, Boom Shot, Hammer of Dawn, or possibly a well-aimed sniper shot. The easiest way to do this is to do the following:

Start the game's campaign on Casual. In the prison, when you reach the door that the locust start to cut down to get through, hide behind the barrier closest to the door. Right before they break through throw a grenade. Time it and position it so it kills all 3 of them. If it doesn't, let the ones who lived kill you. If it does, run outside and let those Locust kill you. If you try to reload the last checkpoint through the Pause Menu instead of getting killed, it won't count. Repeat this 9 times to get this achievement.

Annex is basically a rendition of King of the Hill. A large circle spawns at random on the map, but always around a spot where you can pick up a map weapon (Torque Bow, Longshot, etc.) The first team to get there and stay there uncontested (without the enemy team entering) for a few seconds will 'cap' the circle.

When a circle is capped, everyone in the circle scores a cap, and the team is awarded one point for every second they remain in control. If the enemy enters the circle, they stop scoring, and if the enemy caps the circle, the enemy starts scoring. Each circle will give 60 total points out before it goes away and reappears elsewhere on the map. The first team to hit the score limit wins the round.

Play 100 matches of Annex with 3 or more rounds, and get 3 or more caps in every match to get this achievement.

Note:

• None of the 250 expansion pack achievements have to be done in ranked. They can be done in player, ranked, or a mix of both.
• These can also be done with a two-controller method on a private player match. Simply log in two controllers as Gamertag and Gamertag[2], put them on either team, and make sure your main account wins or does whatever the achievement requires him to do.
• 3+ rounds means that the win limit must be 3 rounds or higher. For example, if a game that is set at 2 rounds is won 2-1, although 3 rounds were played, it will not count.

All Annex games have a point limit, from 120 to 420 in increments of 60. To get this achievement, you must win 20 rounds of Annex by 4 points or less. For example, win with a score of 120-116. 120-115 will not count. You do not have to do these matches in a row or in one match, 20 times over the course of your career will get you the achievement.

For more information, see "THIS! IS! ANNEX!"

For this achievement, you must win 20 rounds of Annex by a complete shutout. For example, win 120-0. This would obviously be best done in a game with 120-point rounds, as all you have to do is cap and hold two straight objectives. Depending on how good your team is, you could win by a shut out more often than you don't.

For more information, see "THIS! IS! ANNEX!"

This is basically the expansion's version of "Around the World". You must be on the winning team on each of the 6 new maps: Old Bones, Raven Down, Subway, Garden, Bullet Marsh, and Process. Remember, they must be 3 or more rounds to count.

For more information, see "THIS! IS! ANNEX!"

See "All That Juice"

See "All That Juice"

See "All That Juice"

Simply play any game with 3 or more rounds, ranked or unranked, in any gametype on this map. Win 20 times and Achievement Unlocked.

For more information, see "THIS! IS! ANNEX!"