Found the Nora War-Chief and defeated the killers in the Ring of Metal.

Respawn the Enderdragon.

Teleport over 100 meters from a single throw of an Ender Pearl.

Stop starvation using Rotten Flesh.

Smelt wood trunks using charcoal to make more charcoal.

Tame a Horse.

Cure a zombie villager.

Kill a Mob while wearing the same type of Mob Head.

Defeat an Evoker.

Relieve a Blaze of its rod.

Kill the Wither.

Eat nothing but Kelp for 3 days.