Here is the full list of all 22 Not Their WIll achievements.
Save for the first time
Kill your first non-tutorial enemy
Consume your first non-tutorial enemy
Break your first blockade
Get your first upgrade
Complete the first level
Complete the second level
Found all the upgrades
Consume your first non-tutorial healer
Throw your first bomber against an enemy
Defeat the excavator with the same or more alien's health you started the battle with
Defeat the scientist with the same or more alien's health you started the battle with
Kill two enemies with one shot
Defeat the excavator in less than 2 min and 40 sec
Defeat the scientist in less than 3 min
Destroy a barrel hitting it with a bomber
Burn 50 enemies
Shock 50 enemies with electricity
Kill 100 enemies
Kill 150 enemies
Kill 200 enemies
Get all achievements