Buy The "Cabinet Of Trinkets" From The Carver.
- The Carver Can Be Found During A Run, Especially Before Boss Fights.
Once You've Done That And Are Back In The Lobby, Select a Trinket And Use A "Trinket Key" To Unlock One.
- Trinket Keys Are Season Rewards, So Level Up For An Hour Or Two, And You Should Have A Few.
Achievement Pops When You Get One Of These Trinkets Unlocked.
Good Luck!