Here is the full list of all 26 SPINGUN achievements.
Rack up 1337 kills
Beat the Pulser Zone
Survive 60 Seconds in Endless Cursed
Survive 30 Seconds in Endless Hardcore
Only the good ones die young...
Beat the Homer Zone
Clear ballpit in under 30 seconds
Survive 2 Minutes in Endless
Beat the Flasher Zone
Beat the Sploder Zone
Beat the Spreader Zone
Survive 30 Seconds in Endless
Survive 60 Seconds in Endless
Wow, how creative!
Beat the Beamer Zone
Beat the Chainer Zone
Beat the Flamer Zone
Beat the Mega Boss
Beat the Super Boss
Beat the Ultra Boss
Complete ALL Zones, WOAH.
Complete ALL Bosses, WOAH.
PEACE BROTHER
Brrrrr!