

This means that it will take you 100 weeks to play the needed 12,000 games to get this pair of achievements. This adds up to 40 hours a week of StarCraft. You can get in 4 hours every weekday and 10 hours on the weekend (leaving you a few hours to go out for beers and talk about StarCraft).
WINGS OF LIBERTY IN UTTER DARKNESS FULL
Now let's say you have a full time job, but are dedicating the bulk of your free time to playing StarCraft. This means you could have an average game length of about 20 minutes, so you can play 3 games an hour. Let's say you have a fairly aggressive play style, preferring to attack early off of one or two bases rather than go for map control. How long does this take? Let's make some assumptions. As a result, this will take approximately 12,000 games of StarCraft 2 to get this pair of achievements.

StarCraft 2 has a pretty good online matchmaking system, meaning that for the sake of approximation (unless you are the best or worst player in the world), you will win 50% of the time.
WINGS OF LIBERTY IN UTTER DARKNESS SERIES
There is no way to progress in both series a the same time. Winning a 1x1 game only gives you progress in the solo achievement series and winning a 2x2 game only gives you progress in the team achievement series. Solo and team are totally separate progress categories.Playing as Random does give you progress in both Random and the race you ended up playing as, but this only reduces the needed number of needed solo and team wins from 4,000 to 3,000. You can't make progress in any of the race achievements simultaneously except by playing Random.Now, winning 1000 games as each race option in both solo and team is really hard for several reasons. "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.

The quickest way to complete all the achievements (assuming you have sufficient skill level) would be to do it like this:
