Gamerscore, trophies and achievements are not the same thing
Three platforms, three systems, three completely different ways of counting the same idea: proof that you did something in a game. They look interchangeable and they are not.
Xbox: gamerscore, a points total
Every Xbox achievement is worth points set by the game's developer. A standard retail game has 1000 points to earn and add-ons usually add more. Your gamerscore is the sum of the points of every achievement you have ever unlocked, across every game and every console generation, on one account. It only goes up. It never resets, and nothing removes points once earned.
The consequence: gamerscore measures lifetime volume, not skill and not completion. A player with 100,000 points might have finished nothing, and a player with 20,000 points might have completed every game they own.
PlayStation: trophies in four tiers
PlayStation does not use points that you see directly. It has bronze, silver, gold and platinum trophies. A platinum is awarded once, when every other trophy in that game except add-on trophies is unlocked, and not every game has one. Behind the scenes each tier is worth points toward a trophy level, a number from 1 to 999 with its own named tiers, reworked by Sony in 2020.
So a PlayStation profile has two headline numbers: how many trophies of each colour, and the trophy level. The platinum count is the one that actually says something about finishing games.
Steam: achievements, and nothing else
Steam achievements have no points at all. A game either has achievements or it does not, and each one is simply unlocked or not. There is no Steam equivalent of gamerscore or trophy level, which is why you cannot rank Steam players on a score the way Xbox does.
What Steam does publish is the global unlock rate of every achievement, the percentage of owners who have it. That makes rarity visible: a 1 percent achievement is genuinely hard, a 90 percent one is the tutorial. On this site your achievements are sorted by rarity for that reason.
Why they cannot be added together
An Xbox point, a PlayStation trophy and a Steam achievement are different units. Adding a 1000 point gamerscore to 40 trophies and 300 achievements produces a number that means nothing. Any site that shows you one combined achievement score across platforms has invented a conversion rate that no platform publishes.
EveryGameStat therefore never merges them. Your card shows a percentage, earned divided by available, per platform and across the games that have achievements at all, plus the platform totals separately. The parts stay visible instead of disappearing into one figure.
What a completion percentage does and does not say
- It only counts games that have achievements. A game without any is not in the denominator.
- Add-on and downloadable content achievements usually count on all three platforms, which is why the maximum for a game can be above 100 percent of the base game.
- Xbox marks achievements as rare below roughly 10 percent of players. PlayStation and Steam publish the raw percentage.
- A high percentage across few games is easier than a modest percentage across a large library.
Where each number comes from here
Xbox gamerscore, achievements and, for most titles, playtime are read through the public Xbox interface. See the Xbox guide. PlayStation trophies and trophy level come from the profile as PlayStation reports them, explained in the PlayStation guide. Steam achievements come with their global unlock rate, covered in Steam hours explained.
