Here is a list of everything,
BUILD,
Living
A fortress using 3 things (wood, stone, glass; Chlorophyte, Luminite, Pearlstone)
A fortress...
A mansion using 3 things (wood, stone, glass; Chlorophyte, Luminite, Pearlstone)
A mansion...
A Biohome (Mushroom (For the truffle), Crimson (For the Painter) etc.)
Farms,
GIANT biomes, Mini-Biomes, Glass Bottles, These ->
Terraria - Vile Mushroom and Rotten Chunk farm with Style (Pixel art)
These -> Terraria - Bait Farm for Worms and Grasshoppers
These ->
FIGHT,
Bosses,
With only melee
With only ranged
With only magic
With only summoner
With only pre-hardmode
With no armour
With one hand (Insane)
All at once
Enemies,
Statue with one second timer
Statue with three second timer
Statue with five second timer
trapped in a 5x5 box (one way doors)
Wow... that is one big list...and i'm not even close to done, well better wrap it up here then...