Gears of War 2 Achievement List

Before we get to the achievements, here are some of the unlocks you will receive in Gears of War 2 if you have achieved certain things in the first Gears of War:

# Complete Act 1 in Gears of War: Unlock Anthony Carmine multiplayer skin in Gears of War 2.
# Find 10 COG tags in Gears of War: Unlock Minh Young Kim multiplayer skin in Gears of War 2.
# Defeat RAAM in Gears of War: Unlock RAAM multiplayer skin in Gears of War 2.

And now for the achievement list:

Green as Grass	Train the rook (any difficulty)	10
It's a Trap!	Story progression in Act 1, Chapter 2	10
Escort Service	Story progression in Act 1, Chapter 4	10
Girl About Town	Story progression in Act 1, Chapter 6	10
That Sinking Feeling	Story progression in Act 2, Chapter 4	10
Freebaird!	Story progression in Act 2, Chapter 5	10
Heartbroken	Story progression in Act 2, Chapter 6	10
Longitude and Attitude	Story progression in Act 3, Chapter 3	10
Tanks for the Memories	Story progression in Act 3, Chapter 4	10
Water Sports	Story progression in Act 3, Chapter 6	10
There's a Time for Us	Story progression in Act 4, Chapter 2	10
Better Wrapped in Beacon	Story progression in Act 4, Chapter 3	10
Have Fun Storming the Castle	Story progression in Act 4, Chapter 6	10
And the Horse You Rode in On	Story progression in Act 5, Chapter 1	10
You Are the Support, Son	Story progression in Act 5, Chapter 2	10
Brumak Rodeo	Story progression in Act 5, Chapter 4	10
Does This Look Infected to You?	Story progression in Act 5, Chapter 5	10
Tourist of Duty	Complete all campaign acts on Casual Difficulty	25
Guerilla Tactician	Complete all campaign acts on Normal Difficulty	50
Artist of War	Complete all campaign acts on Hardcore Difficulty	75
Suicide Missionary	Complete all campaign acts on Insane Difficulty	150
Collector	Recover 5 collectibles (any difficulty)	5
Pack Rat	Recover 20 collectibles (any difficulty)	15
Completionist	Recover all 41 collectibles (any difficulty)	30
One-Night Stand	Complete 1 chapter in co-op on any difficulty (Marcus or Dom)	10
Open Relationship	Complete 10 chapters in co-op on any difficulty (Marcus or Dom)	30
Friends with Benefits	Complete all acts in co-op on any difficulty (Marcus or Dom)	50
Once More, With Feeling	Perform 30 perfect active reloads (any mode)	10
Takes a Licking	Melee 30 Tickers (any mode)	30
Organ Grinder	Kill 30 enemies with a cover mounted Mulcher (any mode)	10
Shock and Awe	Kill 30 enemies with the heavy Mortar (any mode)	10
Said the Spider to the Fly	Kill 10 enemies with a planted grenade (any mode)	10
Crowd Control	Melee 10 enemies down with the Boomshield equipped (any mode)	10
Smells Like Victory	Kill 30 enemies with the Scorcher Flamethrower (any mode)	10
Variety Is the Spice of Death	Kill an enemy with every weapon in the game (any mode)	30
Seriously 2.0	Kill 100,000 enemies (any mode)	50
Standing Here, Beside Myself	Win 3 matches of Wingman (public)	10
Beat the Meatflag	Capture 10 meatflags in Submission (public)	10
It's Good to be the King	Win 10 rounds of Guardian as the leader (public)	10
You Go Ahead, I'll Be Fine	Win three matches of King of the Hill (public)	10
Back to Basic	Successfully complete the 5 lessons of multiplayer Training Grounds	10
Party Like It's 1999	Play 1999 rounds of multiplayer (any mode)	30
Around the World, Again	Win a multiplayer match on each map (any mode)	30
Dirty, Dirty Horde	Survive the first 10 waves of Horde (any difficulty, any map)	20
Hoard the Horde	Survive all 50 waves of Horde (any difficulty, any map)	30

And here are the other 5 achievements provided by GearsofWar.com.

• Crossed Swords – Points 10
  Win 10 chainsaw duels (any mode).
• A Parting Gift – Points 20
  Kill 10 enemies with a grenade while down but not out (any mode).
• Pound of Flesh – Points 10
  Use a meatshield to save your life 10 times (any mode).
• Photojournalist – Points 10
  Submit a spectator photo.
• Kick 'Em When They're Down – Points 10
  Perform all 11 unique executions on a downed enemy.