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