The Binding of Isaac: Rebirth Achievement Data — Unlock Rates for All 641
Using Valve's published global achievement unlock rates, we outline the distribution of achievement rarity. Data retrieved: August 16, 2026
How to read these figures
These figures show the percentage of players who actually unlocked each achievement. They provide an objective reference for difficulty. With 641 achievements, this is among the largest achievement sets covered on this site. Unlocks are tied directly to progression, so the wide spread of unlock rates reflects the game's depth.
641
Total achievements
34
Unlock rate of at least 50%
165
Unlock rate below 10%
2.4%
Lowest unlock rate
- ▸ Highest achievement unlock rate: 84.5%
- ▸ Median unlock rate: 15.4% (half of the achievements have this rate or lower)
- ▸ Unlock rate of at least 20%: 240 achievements / Below 5%: 10 achievements / Below 1%: 0 achievements
These are achievements highlighted on the official Steam store in the source snapshot. They are only a selection of the 641 achievements.
Q. How many achievements does The Binding of Isaac: Rebirth have?
641, according to the Steam store information recorded in the source. Steam highlighted 10 of them, which are listed on this page.
Q. How many players have earned the rarest achievement?
The lowest unlock rate is 2.40%, while the most widely earned achievement has an unlock rate of 84.5%. 165 achievements have unlock rates below 10% (Valve's public data as of August 16, 2026).
Q. Is earning every achievement realistic?
The median unlock rate is 15.4%, and 10 achievements have rates below 5%. Unlocking everything should be expected to take substantial time and practice. The 34 achievements with unlock rates of at least 50% provide a more manageable initial target.
Q. Where do these figures come from?
They come from Valve's published global achievement unlock rates (Steam Web API) and achievement information on the official Steam store. They are not estimates by this site. Individual unlock conditions are omitted until reliable sources are available.