Here is the full list of all 27 Slam Bolt Scrappers achievements.
Beat all campaign levels on expert difficulty
Beat 100 demon cavalry
Steal a weapon of size 8x8 or bigger
Beat 1000 grubs
Steal your way to victory
Beat all the hidden campaign levels
Beat the Campaign
Get past the enemy hoard in Armageddon without dying
Win with only a 2x2 turret left in your tower
Build a 10x10 weapon (on any level other than Mega Blocks)
Beat Downtown 4: The Skyscraper
Beat Skyscraper without dying
Beat Mountain Top 1 without taking any damage
Beat Mountain Top 1
Play 100 Battle Mode Matches
Win a match with only ping pong weapons
Win a 1v2 battle against 2 Hard CPs
Defeat a CP opponent in 1v1 battle before they can drop any blocks.
Play 50 Battle Mode Matches
Watch the entire credits. You're a true fan!
Play 20 Battle Mode matches
Win a match using beverage mode controls
Play 5 Battle Mode matches
Win a level without killing any baddies
Knock out 20 opponents without dying
Play a Battle Mode match
Beat all tutorial levels