Give troops a mount

Give a hero a mount

Build 10 Frost Towers

Complete a campaign without losing any heroes

Complete a campaign on ValeGuard difficulty

Construct a trebuchet

A troop unit reaches max level

Defend a town without building a tower

Defend a town without making troops

Train a Templar unit

Acquire 5 enchanted wells

Acquire the Golden Lute

Become the Skeleton King

A hero reaches max level

Destroy a Goblin War Rig

Train a Longbow Unit

Train a Monk unit

Train a Berserker unit

Get the firework effect from a mystery potion

Gain a level from 'Training in a Bottle' potion

Fight off a bandit attack

Unlock the Druid Class

Unlock the Barbarian Class

Unlock the Engineer Class

Unlock the Hexblade Class

Unlock the Wizard Class

Unlock the Summoner Class

Unlock the Alchemist Class

Unlock the Rogue Class