Finish stage 4
Finish stage 6
Complete all levels
Kill 2000 zombies
Blow up 500 barrels
Earn 100 000 coins
Earn 100 gems
Collect reward for completing 10 quests
Claim Steel Pass on 3 cars
Buy both fuel tank upgrades
Collect all hidden chests
Buy all upgrades on all cars
Burn all your maxed out turbo at once
Buy 5 packs in SHOP