Here is the full list of all 30 Guncraft: Blocked and Loaded achievements worth 1,000 gamerscore.
Reach wave 10 in Onslaught.
Win a 16 player race without using any powerups.
Freeze 100 enemy players.
Destroy an enemy helicopter and watch their snowy body fall into the lava.
Win a match using a class with no bonuses or killstreaks in it.
Kill 100 enemies with your AI SAM Site or Turret.
Capture the flag 100 times.
Kill 100 enemy players.
Get 20 kills without dying.
Get 10 kills without dying.
Get 5 kills without dying.
Destroy 100,000 blocks.
Destroy 1,000,000 blocks.
Destroy 10,000,000 blocks.
Build 10,000 blocks.
Build 100,000 blocks.
Build 500,000 blocks.
Kill 1,000 enemy players.
Kill 10,000 enemy players.
Collect $100,000.
Collect $1,000,000.
Collect $5,000,000.
Freeze 1,000 enemy players.
Get 10 kills between you and your gunner in a single tank.
Hit somebody with the Bunker Buster itself.
Reach wave 25 in Onslaught.
Win a 3 round Spleef match without anyone else scoring any points.
Kill 200 Zombies or Lunatics in Paranoia.
Kill 50 Queens in Paranoia.
Re-Craft for the first time.