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