AchievementRarity

2026.07.13 — initial release

The Wizzleworks' achievement rarity data library, now installable standalone. Data snapshot as of 2026-07-13, built from 830,000+ tracked accounts across US and EU.

Ships with:

• Rarity — the share of accounts holding each achievement (US / EU / global), for 8,349 achievements.
• Rank-at-earn — per-achievement earn-date curves: "you were in the first N% to earn this", retroactive for achievements earned years ago.
• Collection standing — a rarity-weighted score for a whole collection, read out against all tracked accounts: "your achievements are rarer than N% of accounts".
• Tier opinion layer — loot-quality bands (legendary < 0.1%, epic < 5%, rare < 15%, uncommon < 40%, common < 70%) with colours and formatters; consumers can use them as-is or band the raw numbers their own way.
• Freshest-wins — LibStub-versioned by snapshot date, so this standalone copy transparently upgrades any addon that embeds the library; no configuration.

Data honesty, baked in: only accounts active in the last 30 days count and every figure is a floor; achievements with too few tracked earners ship no rank curve; unreliably old earn dates are suppressed; retired achievements are excluded.

MIT licensed — full API and methodology at github.com/wizzleworks-gg/achievement-rarity.