Here is the full list of all 22 White Noise Online achievements.
Pick 200 tapes
Pick 100 tapes
Walk a total of 42,195 meters
Unlock all characters
Finish 20 online games
Win an online game being the only player alive
Lose an online game having all players dead at the same time.
Win a game on nightmare difficulty
Win a game in less than 6 minutes on Normal or higher difficulty
Win a 4 player online game with each player picking 2 tapes
Finish 10 online games
Win a 4 player online game with 4 survivors
Win a game without running
Win an online game without picking any tape
Finish an online game with 4 women characters
You tried to pause while being frightened
Lose the game having found 7 tapes
Finish 5 online games
Win an online game with 4 players
Win a game
Win a 4 player online game with the default characters
Finish an online game