Gears of War 2 Achievement Guide v2.0

Green as Grass                                    Train the rook (any difficulty)  
It's a Trap!                                               Story progression in Act 1, Chapter 2 
Escort Service                                        Story progression in Act 1, Chapter 4 
Girl About Town                                     Story progression in Act 1, Chapter 6 
That Sinking Feeling                            Story progression in Act 2, Chapter 4 
Freebaird!                                               Story progression in Act 2, Chapter 5 
Heartbroken                                           Story progression in Act 2, Chapter 6 
Longitude and Attitude                         Story progression in Act 3, Chapter 3 
Tanks for the Memories                       Story progression in Act 3, Chapter 4 
Water Sports                                          Story progression in Act 3, Chapter 6 
There's a Time for Us                          Story progression in Act 4, Chapter 2 
Better Wrapped in Beacon                  Story progression in Act 4, Chapter 3 
Have Fun Storming the Castle           Story progression in Act 4, Chapter 6 
And the Horse You Rode in On         Story progression in Act 5, Chapter 1 
You Are the Support, Son                    Story progression in Act 5, Chapter 2 
Brumak Rodeo                                      Story progression in Act 5, Chapter 4 
Does This Look Infected to You?      Story progression in Act 5, Chapter 5
One-Night Stand                                    Complete 1 chapter in co-op on any difficulty (Marcus or Dom)     
Standing Here, Beside Myself             Win 3 matches of Wingman (public)    
Beat the Meatflag                                   Capture 10 meatflags in Submission (public)    
It's Good to be the King                         Win 10 rounds of Guardian as the leader (public)        
You Go Ahead, I'll Be Fine                    Win three matches of King of the Hill (public)  
Back to Basic                                          Successfully complete the 5 lessons of multiplayer Training Grounds   
Organ Grinder                                         Kill 30 enemies with a cover mounted Mulcher (any mode)      
Shock and Awe                                       Kill 30 enemies with the heavy Mortar (any mode)      
Said the Spider to the Fly                      Kill 10 enemies with a planted grenade (any mode)      
Crowd Control                                         Melee 10 enemies down with the Boomshield equipped (any mode)    
Smells Like Victory                                 Kill 30 enemies with the Scorcher Flamethrower (any mode)   
Once More, With Feeling                       Perform 30 perfect active reloads (any mode)
Pound of Flesh                                        Use a meatshield to save your life 10 times (any mode)
Photojournalist                                        Submit a spectator photo
Kick 'Em When They're Down               Perform all 11 unique executions on a downed enemy
Crossed Swords                                     Win 10 chainsaw duels (any mode)

A Parting Gift                                      Kill 10 enemies with a grenade while down but not out (any mode)

Party Like It's 1999                            Play 1999 rounds of multiplayer (any mode)    
Around the World, Again                   Win a multiplayer match on each map (any mode)       
Hoard the Horde                                Survive all 50 waves of Horde (any difficulty, any map)
Takes a Licking                                  Melee 30 Tickers (any mode) 
Variety Is the Spice of Death            Kill an enemy with every weapon in the game (any mode)
Completionist                                     Recover all 41 collectibles (any difficulty)        
Open Relationship                            Complete 10 chapters in co-op on any difficulty (Marcus or Dom)        

Friends with Benefits                       Complete all acts in co-op on any difficulty (Marcus or Dom)
Seriously 2.0                                     Kill 100,000 enemies (any mode)
Guerilla Tactician                             Complete all campaign acts on Normal Difficulty