Mortal Shell II Peter's Perfect Parry Not Unlocking
Published 2026-09-06 · Updated 2026-09-06
A cautious checklist for the Peter's Perfect Parry achievement when Mortal Shell II players report it not unlocking on PC.
Sources
Checked on 2026-09-06. Store details and balance may change after patches.
Evidence level
Checked on 2026-09-06. The current public evidence is a Steam Bug Reports thread where a PC player says Peter's Perfect Parry is not working after repeated attempts, plus broader achievement-bug threads. That is enough to create a player-facing diagnostic page, but not enough to state a confirmed global bug or a guaranteed workaround.
Before assuming it is bugged
Use the current retail build, restart Steam after patching, and verify that the run has not mixed in a known achievement-sync anomaly from Steam Deck. Then record what you count as the successful action: enemy, attack, parry input, critical follow-up, damage result, Shell, weapon, Seal state, online/offline state, and whether any related achievement unlocked in the same session. Keep this as a short test set rather than grinding for hours without evidence.
Safe troubleshooting
Try a fresh session, one familiar low-risk enemy, and one controlled parry type. Avoid changing Shell, weapon, Seal, input device, and Steam device at the same time. If the achievement still does not unlock after a repeatable clip, report it with the clip and platform details. Do not delete saves or reset Steam Cloud for a single achievement unless official support instructs you to do so.
What this page does not claim
This page does not define the exact hidden counter, required enemy, or frame window because no checked source publishes those details. It also does not claim that every PC player is affected. The supported advice is narrower: verify the current build, isolate one repeatable parry case, and report the evidence instead of assuming an old route or another player's unlock timestamp proves the condition.