Here is the full list of all 20 Anomaly Defenders achievements.
Accomplish all missions in all difficulty settings
Accomplish all missions in hard diffuculty setting
Earn 225 Technology Points
Use Sniper function on Scorcher 20 times
Use Explode function on Blaster 10 times
Do not lose any tower in 12 consecutive missions
Acquire technology of Enforcers Top Level Upgrade
Accomplish all missions
Build 10 Scorchers in one mission
Build 10 Stormers in one mission.
Build 20 Blasters in one mission
Acquire technology of Harvesters Top Level Upgrade
Acquire technology of Rage 3rd Level
Accomplish 15 missions
Use Rage function on Behemoth 30 times
Acquire technology of Energy Management 3
Accomplish 10 missions
Do not lose any tower in 6 consecutive missions
Accomplish 5 missions
Do not lose any tower in 2 consecutive missions