(Spoiler Alert!) This is how you unlock the new outfits, a plain and basic guide. If you have questions, ask them in the comments section!
Note: you can also click here to read the spoiler-safe version.
How to unlock the outfits
Hotline Miami: Kill an enemy with the Baseball Bat after stunning them by destroying a door or hitting them with falling debris
Katana Zero: Kill 15 consecutive enemies with Hattori’s Katana’s dashing strike without getting hit
Risk of Rain: Kill the two shadow imps that spawn from the random altar in biomes
Terraria: Drop an item into lava (done by entering the Cavern Key door in Prisoners’ Quarters, then dropping the backpacked item and using the Homunculus Rune to throw it into the lava)
Slay the Spire: Collect 3 keys, the Emerald Key is from an elite room, the Sapphire Key is from a choice altar in a biome and the Ruby Key is from a shop (This one is currently bugged, you need to disable “Merchandise Shop Categories” in Custom Mode > Advanced Options > Meta Modifiers, or find it in a food shop
Credit to SpeedyCookie
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