Colors
Bronze – Lose every possible way
Silver – Win every possible way
Gold – Win every possible way and lose every possible way
Glitter Lime – Complete all tasks and solve at least 1 crisis
Glitter Pink – Win as Impostor without sabotaging or using vents
Glitter Cyan – Win as Impostor without killing
Glowy Purple – Be in all rooms in one game
Glowy Blue – Be in all vents in one game
Glowy Red – Be in all rooms and in all vents
Rough Maroon – Call a Meeting
Rough Black – Report a Body
Rough White – Kill and Report the Body
Gaseous Green – Unlock all achievements
Ozone Orange – Unlock all achievements
New Free Colors: Gray and Maroon
Hats, Suits, and Full Costumes
Discoball (Hat) – Be the first to finish all tasks
Poop (Hat) – Help vote out a partner in crime
Storm Cloud (Hat)
Farmer (Full Costume;) Straw Hat with Wheat; Overalls
Source: https://www.reddit.com/r/AmongUs/comments/l6atpc/among_us_ideas_achievements_optional/