Buy one archer
Hit first time
Kill 15 skeletons in the 60 second of first night
Meet the Merchant
Survive 20 nights
Buy Musket
Buy Archer, Gunman, Tower level 3, Crossbow, Musket and Tower Gun
Buy 5 Archers
Buy 10 updates for wall
Earn More Than 5000 Gold for one night
Buy 20 Arrows For Bow
Buy Crossbow
Buy 3 updates of tower
Kill 100 skeletons in one session of the game
Kill Deathlord
Save 10 people
Buy a Magic Weapon
Buy a Legendary Weapon