Here is the full list of all 14 PlanTechtor achievements.
Destroy all those invading World 1
Destroy all those invading World 2
Destroy all those invading World 3
Destroy all those invading World 4
Destroy all those invading World 5
Win level 5-1 after shooting a 1,000% buffed Fire Bazooka
Win level 5-2 after shooting a 1,000% buffed Ice Pistol
Win level 5-3 after shooting a 1,000% buffed Lightning Pistol
Win level 5-4 after shooting a 1,000% buffed Target Dummy Bazooka
Win level 5-5 after shooting a 1,000% buffed Damage Field Bow
Win level 5-6 after shooting a 1,000% buffed Poison Bow
Win level 5-7 after shooting a 1,000% buffed Stun Bazooka
Win level 5-8 after shooting a 1,000% buffed Turret Pistol
Win level 5-9 after shooting a 1,000% buffed Heal Bow