Here is the full list of all 57 ShellShock Live achievements worth 1,000 gamerscore.
Beat the dev (kChamp) OR beat a lv.100 who has the achievement
Earn 100,000 XP
Play 500 rounds
Land 100 Buff Skill Shots
Save up 1,000 Gears
Complete 45 missions
Attempt missions 100 times
Pick up 250 crates
Destroy 200 enemy tanks
Land 100 Bumper Skill Shots
Hit two enemies in one shot 100 times
Win 100 rounds
Land 25 Portal Skill Shots
Land a shot that hits both side bumpers
Hit three enemies in one shot
Land 25 Buff Skill Shots
Play 100 rounds
Destroy 50 enemy tanks
Land 25 Bumper Skill Shots
Complete 15 missions
Land 5 Portal Skill Shots
Earn 10,000 XP
Pick up 50 crates
Save up 250 Gears
Win 25 Deathmatch rounds
Land 5 Bumper Skill Shots
Deal 200+ damage in one shot
Deal 300+ damage in one shot
Hit two enemies in one shot 10 times
Win 20 rounds
Land 5 Buff Skill Shots
Play 20 rounds
Earn 1,000 XP
Win 5 rounds
Play 5 rounds
Hit two enemies in one shot
Play 2,000 rounds
Win 500 rounds
Win 2,000 rounds
Complete 75 missions
Earn 1,000,000 XP
Hit three enemies in one shot 10 times
Destroy 1,000 enemy tanks
Save up 2,500 Gears
Win 25 Points rounds
Win 25 Assassin rounds
Win 25 Juggernaut rounds
Assassinate 50 enemy tanks
Assassinate 250 enemy tanks
Win an 8 player round as the Juggernaut
Land 100 Portal Skill Shots
Win 25 Rebound rounds
Win 25 Marksman rounds
Win 25 Charge rounds
Win 25 Shoccer rounds
Land a shot that hits a bumper, a portal, and an X2
Survive 25 shots in Marksman