Construct a Nether Portal.

Acquire diamonds with your iron tools.

Mine 1,728 Cobblestone and place it in a chest.

Defeat 1,000 enemies.

Use an Elytra to fly through a 1 by 1 gap while moving faster than 40 m/s.

Use Riptide to give yourself a boost.

Activate a Conduit.

Breed two cows with wheat.

Discover a Shipwreck.

Craft and place a Flower Pot.

Smelt an iron ingot.

Stop starvation using Rotten Flesh.

Attack and destroy a monster.