Here is the full list of all 38 Who's Who? achievements.
Achieve victory without taking out anyone
four or more players survived until the time limit
Without moving at all, achieve 5th place in a full room
Rescue your teammates
Rescue your teammates 5 times in a game
Steal 10 treasures in a game
Clear the treasure minigame in 3 seconds
Steal the treasure
As a police, catch 4 thieves consecutively
Toss the bomb to other players
Toss the bomb 3 times to other players in a game
2 players give and take the same bomb
Win the Squad mode with all your teammates alive
Win the Squad mode while all your teammates are Knocked out
Use 4 teleport items in a game
Use 6 items in a game
Get knocked out in 10 seconds after the game begins
Kick another player within 10 seconds after the game begins
Knockout 5 players in a game
Kick NPC 5 consecutive times in a game
Stay and watch the game until the end even when Knocked out {10times}
First Knockout
Get attacked within 5seconds after attacking a NPC
Win in a Police and Thief mode
Win in a Bombs Away mode
Win in a The Squad mode
Achieve atleast 5th place in a Where is Everybody mode when the room is full
Open the locked door 50 times
Steal the treasure 50 times
Toss the bomb 50 times
Rescue another player 50 times
Knockout other players 50 times
Start the game 10 times with Quick start
End the Tutorial
Who made the game?