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