Beast of Reincarnation Boss Achievement Roadmap: Names Steam Confirms

Steam’s global achievement page provides a reliable spoiler-light boss checklist even though it does not publish a complete boss database. The named entries currently include Rangifer’s End, Lacerta’s End, Taurus’s End, Corvus’s End, Erymanth’s End, Ursa’s End, Koo de Grâce, Shidou & Nue, and Kunai & Kirin. These names are official Steam achievement data; this page does not claim that the list is every field boss or that each name describes a conventional boss fight.

The confirmed boss-name checklist

• Rangifer’s End
• Lacerta’s End
• Taurus’s End
• Corvus’s End
• Erymanth’s End
• Ursa’s End
• Koo de Grâce
• Shidou & Nue
• Kunai & Kirin

The Rangifer boss guide is the only page in this list that currently carries a complete, post-launch fight boundary on this site. For the other names, use the official Steam stats page to watch when each achievement appears in your account, then add a route only after checking the shipped encounter.

Do not confuse boss names with achievement percentages

The Steam stats percentages are global snapshots. They show how many Steam players have unlocked an achievement, not the boss’s health, difficulty, recommended level, or whether the achievement is missable. A low percentage may reflect story progress or release timing rather than a secret mechanic.

For combat preparation, keep the elements and stagger guide open. It explains the shipped weakness and stagger vocabulary without pretending that a generic weakness rule replaces a boss-specific test.

Sources

• Steam Global Gameplay Stats - official achievement names and live global percentages. Checked August 14, 2026.
• Rangifer Nushi boss guide - internal post-launch fight coverage.
• Beast of Reincarnation on Steam - official boss-and-journey framing. Checked August 14, 2026.