Can I remove achievements that unlocked early?

This page does not recommend trying to alter Steam achievement state. Preserve evidence and ask official support if profile cleanliness matters to you.

Does this mean Stoned or Bring My Ova Back to Me is fixed?

No. Early achievement grants after device sync are a different problem from a normal unlock condition or a stuck tracker.

Troubleshooting

Mortal Shell II Steam Deck Achievements Bug: What to Check Before Continuing

Published 2026-09-06 · Updated 2026-09-06

How to handle Mortal Shell II achievements suddenly unlocking after loading a PC save on Steam Deck, without damaging your save or trophy route.

Accuracy note: Source-backed and checked 2026-09-06. Patch-sensitive values are excluded unless verified.

Sources

Checked on 2026-09-06. Store details and balance may change after patches.

Current status

Checked on 2026-09-06. Multiple Steam Bug Reports describe players loading a Mortal Shell II save on Steam Deck and receiving late-game achievements early, including Stoned, Bring My Ova Back to Me, So Fresh, So Clean, Sat Nav, Shell Seeker, Guns, Lots of Guns, and Lord of War. The evidence supports a Steam achievement-sync warning for PC-to-Deck players. It does not prove that every achievement can be forced, that the unlocks are intended, or that Valve or the developer will retroactively change a profile.

What to do now

Before switching devices again, let Steam finish Cloud Sync on the current device and take screenshots of the achievement list, playtime, save slot, and current objective. If achievements unlocked unexpectedly, do not delete the local save or try to roll Steam Cloud backward unless official support tells you to. Continue only after deciding whether you care about a clean achievement route, because replaying organically may not undo already granted platform achievements.

How to isolate the trigger

Record whether the save was created on PC, loaded on Steam Deck, moved back to PC, or played offline. Note whether the game was updated between device switches and whether Steam showed a Cloud conflict. If you can reproduce the issue on a separate low-risk save, report that path. Do not test on your only completion save.

Achievement route caution

If you are building a 100% route, separate in-game completion from platform achievement timestamps. A Steam profile can show the achievement even if the current save has not reached the matching milestone. For guide use, verify unlock conditions from current retail play or official patch notes rather than using a bugged timestamp as proof of a mechanic.