Get 10 Airshots.

Collect a crate.

Collect a health crate.

Use a special weapon.

Buy a new fort.

Get to wave 20.

Get to wave 30.

Get to wave 40.

Have fired 1000 rounds.

Have upgraded a fort to full.

Get at least a 3-strong airshot streak.

Earn 40,000 coins in total.

Kill 1,000 soldiers.

Kill 10,000 soldiers.

Throw a hundred sticks of TNT.

Unlock all scenarios.

Spend over 5,000 coins in one purchase.

Have unlocked and fully upgraded all the forts.