Here is the full list of all 43 Trial Of Empires TD achievements.
You've killed a BOSS by a Voltage line
You've killed 600 enemies in a game
You have completed Trial Of Empires TD Tutorial
You've killed a BOSS
You've killed a BOSS by an Archer
You've killed a BOSS at Night
You've unlocked an Active Spell
You've unlocked a Passive Spell
You've became #1 at leaderboard
Congratulations!
You've saved a life
You've killed 750 enemies in a game
You've killed 900 enemies in a game
You've killed 50 enemies by Headshot in a game
You've dealed 250,000,000 damage with a single Tower
You've killed 15 BOSS in a game
You've unlocked all Allies
You've played 1000 hours in total gameplay
You've unlocked a new Avatar and Title
Congratualtions. You've completed the game in Hardcore Mode!
You've slaughtered 1,000,000 enemies in total
You've saved 20 life with Level 11 Soldier in a game
You've killed 500 enemies with a single tower in a game
You've unlocked an Ally
You've killed all enemies in a single wave in a co-op game
You've became #1 at Seasonal leaderboard out of 1000 Co-op players
You've played 100 Co-op games