Gears of War 2 - Tai Kaliso

Skorge
to unlock Skorge for use in multiplayer, complete Act 5 in single-player mode on any difficulty.

RAAM
To unlock RAAM for use in multiplayer, have the "A Dish Best Served Cold" achievement on your hard drive from the original Gears of War.

Minh Young Kim
To unlock Lt. Minh Young Kim for use in multiplayer, have the "Time to Remember" achievement on your hard drive from the original Gears of War.

Kantus
To unlock Kantus for use in multiplayer, complete Act 2 in single-player mode on any difficulty.

Insane Difficulty
To unlock the Insane Difficulty level, complete the game once through on any difficulty setting previously available.

Flame Grenadier
To unlock the Flame Grenadier for use in multiplayer, complete Act 4 in single-player mode on any difficulty.

Dizzy Wallin
To unlock Dizzy Wallin for use in multiplayer, complete Act 1 in single-player mode on any difficulty.

Anthony Carmine
To unlock Anthony Carmine for use in multiplayer, have any Act 1-related achievements unlocked on your hard drive from the original Gears of War.

Achievements:
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 on any difficulty.
Zen and the Art Part 2 20 points: Perform 5 perfect active reloads in a row on any difficulty.
Clusterluck 20 points: Kill 3 enemies at once 10 different times on 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.

The following achievements require the downloadable content update for Annex mode and the Hidden Font Maps.

"THIS IS ANNEX" 40 points: Complete 100 multi-player matches of over 3 rounds in Annex and capture 3 objectives in each match.
"Inconceivable" 30 points: Win 20 rounds of multi-player matches in Annex by fewer than 5 points.
"Nub Pwn3r" 30 points: Win 20 rounds of multi-player matches in Annex by shutting out the opposing team.
"You Down With E.P.I.C?" 30: Win a multi-player match of over 3 rounds in any game type on 6 different downloadable maps.
"Green Thumb" 30 points: Win 20 multi-player matches of over 3 rounds in any game type on the Garden multi-player map.
"Mind the Gap" 30 points: Win 20 multi-player matches of over 3 rounds in any game type on the Subway multi-player map.
"All That Juice" 30 points: Win 20 multi-player matches of over 3 rounds in any game type on the Process multi-player map.
"Purdy Mouth" 30 points: Win 20 multi-player matches of over 3 rounds in any game type on the Bullet Marsh multi-player map