Hit the Mayo 5 times!

Harvest some leather.

You killed 5 opposing team members.

GTA Online: Use custom vehicles to win 5 races.

Throw diamonds at another player.

Acquire diamonds with your iron tools.

Discover a Shipwreck.

Construct a furnace out of eight cobblestone blocks.

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

Use planks and sticks to make a pickaxe.

Open your inventory.

Complete all Under the Bridge and Knife Flight challenges.