Eliminate 700 Alien enemies.

Build the Alien Tower.

Buy all weapons, munition and weapon upgrades in shop.

Complete the tutorial.

Eliminate 100 enemies by using the Cyber Bow.

Eliminate 80 enemies by using the Sniper Rifle.

Master the challenge mode.

Collect 7,000 Credits.

Survive an attack wave in classic or challenge mode with a goal's hit point of 1.

Eleminate 6 enemies within 10 seconds by using the Dual Wield Pistols.

Complete Level 1.

Complete Level 2.

Complete Level 3.

Complete Level 4.

Complete Level 5.

Complete Level 6.

Complete Level 7.

Eliminate 100 enemies by using explosives.

Eleminate a Skilith Air Protect by using the Cyber Bow.

Generate 5,000 energy with the Energy Gun

Change your skin

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.

Ignite 300 enemies with the Flamethrower

Eliminate 50 Skilith Repair

Eliminate 1000 Skilith

Hack 20 Skilith Repair with the Hacker Arrow

Master an attack-wave without a single tower

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

Freeze 4 enemies at once with the Remote Ice Mine

Survive 15 minutes in survival random mode

Use the Stealth Detector

A tower causes more than 5,000 damage

Master the classic mode.

Build all tower types

Master all 7 Oasis attack waves.