Here is the full list of all 24 Jump Gunners achievements.
You found the secret in the tutorial
You waited 33 years for that...
You cleared your first challenge level
You just aced your first challenge level
You cleared 10 challenge levels
You aced 10 challenge levels
You cleared all the challenge levels
You aced every challenge level!
You found 5 hidden gems
you found 10 hidden gems
You found 15 hidden gems
Way to go, you found all the hidden gems!
Two headjump kills without touching the ground, you'd make a plumber proud
Played your first local multiplayer game
You played 100 local multiplayer games
Players have killed each other over 500 times
Players have shot over 10,000 bullets
Players have died from stuff falling on their heads over 100 times
Over 200 Turkeys have seen a bullet up close and personal
Wow, you really want those medals huh? You've tried the single player levels over 100 times
Over 100 kills from headjumping!
You've lobbed over 200 hot potatoes
You unlocked every achievement!
You killed over 50 enemies in horde mode!