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Also, some games had their achievements added after release (in some cases years). Achievements don't usually get backfilled to my knowledge, so any players wit

• larsiusprime 8y ago
  This isn't the case, actually. Testing it against known sales data, the "achievers" stat derived by this method was ALWAYS higher than the # of ppl who had downloaded the game, or the # of ppl who had played it for at least 1 minute (these stats are known privately to developers). We don't know exactly how the total "achievers" pool for a game is calculated, but we know it isn't a simple measure of people who had achieved at least one achievement. It's almost certainly some measure of the total population that is able to register achievements, regardless of whether they have registered any. It probably includes something like family sharing accounts, so it doesn't exactly correspond to actual sales directly, but it seems to be roughly in the middle between the "players" and "owners" stats SteamSpy used to report. Sometimes it would overshoot both, but it was never less than "players."