Armored out - Create every end game armor (beetle, shroomite, etc. unless there is new end game items, do those.)
Rarest killer - Murder every rare enemy (Tim, Rune Wizard, etc.)
The 80's - wear the entire plumber outfit
Ice to meet you! - Wear the entire frost armor
Smells like barbecue. - Set 5 enemies on fire in under 10 seconds (Anything which caused fire damage)
Red, Green.. Wheres blue? - Craft the entire plumber outfit and the entire hero outfit.
Come at me bro! - Get 5 characters into hardmode.
This is my final form! - Summon the wall of flesh.
Costume Party - Start the pumpkin moon.
The day Christmas burns - Start the Frost Moon.
Best Costume - Get to the final wave of pumpkin moon.
Savior of Christmas - Get to the final wave of frost moon.
RIP the King - Get the Pumpkin Blade
Father Christmas - Get the Christmas Tree Sword
Are you reddy? - Start up Extreme Mode (Totally not a pun)
Something smells fishy.. - Kill Duke Fishron
Witchcraft is best Craft! - Get Witch Doctor and kill Golem.
Slimibalism - Craft Slime staff and kill 50 slimes with it.
Legit. - Kill Goblin, Frost, and Pirate invasion (or any other invasion excluding the moons) without even clicking. (Traps and summoners)
The tale of two Kings - Kill pumpking and king slime