Turn wheat into bread.

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

Smelt an iron ingot.

Attack and destroy a monster.

Construct a furnace out of eight cobblestone blocks.

Use planks and sticks to make a pickaxe.

Punch a tree until the block of wood pops out.

Kill 20 enemies in a row while driving a vehicle in Single Player or Special Ops.

Knife an enemy without him ever knowing you were there in Single Player or Special Ops.

Assault Makarov's safe house.

Execute the plan to help the Americans.

Use a riot shield to beat down an enemy in Single Player or Special Ops.

Kill at least 10 enemies with one Predator missile in Single Player or Special Ops.