Find Alt Cunningham.

Kill or incapacitate an enemy who threw a grenade at you.

Tame a Horse.

Cook and eat a pork chop.

Smelt wood trunks using charcoal to make more charcoal.

Craft and place a sign.

Craft and place a Flower Pot.

Throw diamonds at another player.

Smelt an iron ingot.

Construct a better pickaxe.

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

Use planks and sticks to make a pickaxe.