Here is the full list of all 30 Twisted Arrow achievements.
Kill 300 RCS Soldiers
Kill Steve
Kill 100 Zombies
Kill Kevin
Complete Game On Easy
Complete Game on Normal
Complete Game on Hard
Complete a mission using only standard arrows
Destroy 100 Lights
Destroy 500 Lights
Destroy 1000 Lights
Destroy 100 Crates
Destroy 500 Crates
Destroy 1000 Crates
Kill 500 RCS Soldiers
Kill 1000 RCS Soldiers
Kill 1500 RCS Soldiers
Kill 15 Snipers using only normal arrows
Finish a mission with 100% accuracy
Finish a mission with >74% accuracy
Finish a mission with <25% accuracy
Kill 100 enemies with barrel explosions
Kill 100 enemies with split arrows
Kill 100 enemies with mine arrows
Kill 500 enemies with explosive arrows
Freeze 100 enemies
Kill 50 drones
Convert 25 Turrets to your side
Destroy 10 Mechs
Destroy 25 Turrets