Eliminate 700 Alien enemies.
Build the Alien Tower.
Design and play a custom level.
Buy all weapons, munition and weapon upgrades in shop.
Master an attack-wave without a single tower
Complete Level 2.
Complete the tutorial.
Eliminate 100 enemies by using the Cyber Bow.
Eliminate 80 enemies by using the Sniper Rifle.
Master the challenge mode.
Survive an attack wave in classic or challenge mode with a goal's hit point of 1.
Complete Level 1.
Eliminate 100 enemies by using explosives.
Complete Level 3.
Eleminate a Skilith Air Protect by using the Cyber Bow.
Generate 5,000 energy with the Energy Gun
Change your skin
Complete Level 4.
Collect 7,000 Credits.
Use the Observation Deck for a better oversight.
Eliminate 100 enemies by using the Dual Wield Pistols.
Hack 20 Skilith Shield with the Hacker Arrow
Eliminate 150 enemies by using the Mini Gun.
Eleminate 6 enemies within 10 seconds by using the Dual Wield Pistols.
Eliminate 50 Skilith Repair
Complete Level 5.
Complete Level 6.
Ignite 300 enemies with the Flamethrower
Build all tower types
Eliminate 1000 Skilith
Complete Level 7.
Hack 20 Skilith Repair with the Hacker Arrow
Master all 7 Oasis attack waves.
Use up all available Defense Points in level 5, 6 or 7
Buy all items in the shop.
Eliminate 120 enemies with the Heavy Pulse Rifle
Survive 15 minutes in survival classic mode
Survive 15 minutes in survival random mode
Freeze 4 enemies at once with the Remote Ice Mine
Use the Stealth Detector
A tower causes more than 5,000 damage
Master the classic mode.
