

"Multiplayer Zen Master" use to be a third demon on the list, but since they removed Free For All from multiplayer matchmaking, they also removed the free for all achievements, making "Multiplayer Zen Master" basically meaningless now that it does not contain the "Win 800 Free For All games" achievement. Each of these require you to win 1000 games with each of the four race options: Terran, Zerg, Protoss, and Random.

In this category, there are two achievements in particular that are the big nasties: "Solo Zen Master" and "Team Zen Master". The following analysis will show why, and just what kind of time scales we are looking at. All of the other achievement categories combined (all three Campaigns, Mission Packs, Custom Games, Exploration, Arcade, and Co-op) will take you less time to complete than the Multiplayer achievements. The reason for this is the Multiplayer category. If you are an achievement completionist, you probably want to define some more realistic goals with respect to StarCraft 2, such as just completing the campaign achievements, because to actually get them all will take a very long time. When you say "get all achievements", this is a really big task. There are almost a thousand different achievements available as of 2016. Beat it on Insane and get credit for Very Hard, Hard, and Medium. Also for the difficulty related ones, do them on insane and they will give you credit for all the lower difficulties. Same rules apply with the co-op ones because most of them are race related (beat it on Random, gives you credit for random and the race you played as).All the other random ones like, "Kill a full medivac", "Regen 500 HP on a roach", get "50 kills with one unit" (I BC rushed for this one and sent SCVs to repair), will all come in time as you get each race.

This goes the same with the Co-op games vs. So random race as Protoss when you start the game you will get credit for one win as random and one win as Protoss. When you get a win with random, it will also count as the race you randomed as.
