Here is the full list of all 30 Treadnauts achievements.
Shoot yourself with a bullet in the lobby
Complete the tutorial
Complete a game on Rust Valley with Nalani
Win a netplay game
Win 100 netplay games
Complete a game with Santi
Earn a medal on every Target Test
Earn a gold medal on every Target Test
Stay in the air for 7 seconds
Destroy two enemies with one shot
Win a 3v1 Team Attack
Reach level 10
Reach level 20
Reach level 30
Complete a game on Dreamland with Wagner
Complete a game on Wave District with Momo
Complete a game on Salt Harbor with Rohan
Win a Team Attack game online with a friend
Knock someone into the fog on Wave District
Score a kill with a skipped bullet
Get 100 kills with physics objects
Clash a bullet with an afterlife target
Pop off on the win screen
Pop off 1,000 times
Squash 100 tanks
Squash a tank with a shield
Win a game of Moonsquashers
Zap someone while riding the Science Ball
Get a kill with a nautical mine
Earn a silver medal on every Target Test