The Beginning?

Spawn the Wither

The Beginning.

Kill the Wither

Beaconator

Create and fully power a Beacon

Overpowered

Eat a Notch Apple

Tie Dye Outfit

Dye all 4 unique pieces of Leather Armor.

Trampoline

Bounce 30 blocks upward off a Slime Block.

The Student…

Win a public Battle mini game.

…has become the Master

Win 3 public Battle mini games in a row.

'Tis but a scratch

Take 100 damage in a round of a public Battle mini game.

Cupid

Kill 2 players in a round of public Battle mini game using a bow and arrow.

Hunger Pain

Kill a player while you are starving in a Battle mini game.

Mine!

Open every chest in a Battle mini game arena in one round.

The End... Again...

Respawn the Enderdragon

You Need a Mint

Collect Dragon's Breath in a Glass Bottle.

Super Sonic

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

Dry Spell

Dry a Sponge in a Furnace.

Free Diver

Stay underwater for 2 minutes.

Super Fuel

Power a Furnace with Lava.

Saddle Up

Tame a Horse.

Taste of Your Own Medicine

Poison a Witch with a Splash Potion.

Beam Me Up

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

Map Room

Place 9 fully explored, adjacent Maps into 9 Item Frames in a 3 by 3 square.

Camouflage

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

Back from the Dead

Win 3 rounds in a row after one of the opponents has won 2 rounds.

S-No Throw

Win a single round of Snowball Tumble without throwing any Snowballs.

Snow Storm

Hit a single Player with 25 Snowballs in a single public round.

Hotshot

Hit a Player with a Snowball while falling into the Lava.

Snowplough

Push three Players into Lava using Snowballs.

Overlord

Stay on the top layer while winning a round in a Snowball Tumble Mini Game.

Underdog

Win a Tumble game whilst on the lowest layer in a Snowball Tumble Mini Game.

The Deep End

Defeat an Elder Guardian.

Great View From Up Here

Levitate up 50 blocks from the attacks of a Shulker.

Change of Sheets

Dye your bed a different color.

Cheating Death

Use the Totem of Undying to cheat death.

So I Got That Going For Me...

Lead a Caravan containing at least 5 Llamas.

Let It Go!

Walk across the surface of a deep ocean by freezing the water with Frost Walker boots.

Feeling Ill

Defeat an Evoker.