Construct a Dispenser.

Bake a cake using wheat, sugar, milk and eggs!

Construct one type of each tool (one pickaxe, one spade, one axe and one hoe).

Swim in lava while having the Fire Resistance effect.

Eat a Notch Apple.

Construct a Nether Portal.

Construct an Enchantment Table.

Cook and eat a pork chop.

Construct a furnace out of eight cobblestone blocks.

Use planks and sticks to make a pickaxe.

Defeat Tiny Tiger.

Unlocked the Secret Exit in Unbearable.

Unlocked the Secret Exit in Bear Down.