How many achievements are in Mortal Shell II?

The exact count depends on the current patch. The Steam page confirms achievements are supported.

Did Patch 86328 fix the Tar Golem achievement?

The patch says it should trigger more reliably, but does not guarantee it.

Can I get all achievements in one playthrough?

Most can be obtained in one thorough playthrough, but some may require New Game Plus.

Is Bring My Ova Back to Me stuck at 99% confirmed?

A Steam Bug Reports developer reply says the team is aware of a PS5 Prologue Skip report and is looking into a solution.

Is Baghead Special Moonshine confirmed as an official achievement bug?

No. As of 2026-09-01, it is a community-reported NG+ risk without an official fix note.

Getting Started

Mortal Shell II All Achievements Guide: Steam Achievements List

Published 2026-08-25 · Updated 2026-09-01

Track every Mortal Shell II Steam achievement with verified unlock conditions, bug fixes from Patch 86328, and a safe completion roadmap.

Accuracy note: Source-backed and checked 2026-09-01. Patch-sensitive values are excluded unless verified.

Sources

Checked on 2026-09-01. Store details and balance may change after patches.

Achievement Basics

Mortal Shell II on Steam includes achievements for story progression, exploration, combat milestones, and collectible completion. The retail Steam page confirms Steam Achievements as a supported feature.\n\nThis guide covers achievement categories and known issues. Exact achievement names and counts may be updated by future patches.

Story Progression Achievements

These achievements unlock automatically as you advance through the main story. They cannot be missed on a normal playthrough:\n\n- Prologue completion\n- Reaching the open-world hub\n- Major boss defeats\n- Story milestone events\n\nIf a story achievement fails to unlock, verify your game is on the current patch and try reloading the save after the trigger event.

Exploration Achievements

Exploration achievements reward thorough world traversal:\n\n- Map fragment collection: Finding a certain percentage of the 11 map fragments.\n- Beacon cleansing: Activating a number of Beacons across the world.\n- Shell discovery: Possessing a certain number of Shells.\n- Optional dungeon completion: Clearing side dungeons not required for the main story.\n\nThese achievements encourage methodical exploration. Do not rush the main story if you want to unlock them in one playthrough.

Combat and Build Achievements

Combat achievements test your mastery of specific mechanics:\n\n- Posture breaks: Shattering enemy posture a certain number of times.\n- Critical strikes: Landing critical attacks after posture breaks.\n- Shell ability usage: Using each Shell's active ability effectively.\n- Weapon variety: Defeating enemies with different weapon families.\n\nThese unlock naturally as you play if you experiment with different builds. If you are achievement-focused, rotate weapons and Shells during exploration rather than sticking to one build.

Known Issues: Tar Golem Achievement (Patch 86328)

Patch 86328 specifically addressed the Tar Golem achievement, which was not triggering reliably for some players. If you defeated the Tar Golem before this patch and did not receive the achievement:\n\n1. Update to Patch 86328 or later.\n2. Defeat the Tar Golem again.\n3. If it still fails, capture your platform, patch version, and online status.\n\nThe patch note says the achievement 'should trigger more reliably,' not that it is guaranteed. Report persistent failures with evidence.

Developer-Acknowledged PS5 Ova Trophy Report

Last checked on 2026-09-03. A PS5 player reported Bring My Ova Back to Me stuck at 99% on version 1.000.007 after using Prologue Skip, completing the first playthrough and NG+, and unlocking So Fresh, So Clean. A developer reply in the Steam Bug Reports thread says the team is aware of the bug and looking into a solution. This supports a narrow warning for affected PS5 players, not a universal Ova-location claim or a confirmed workaround. Preserve your save and evidence rather than deleting local data or forcing a cloud overwrite.

Community Report: Baghead and Special Moonshine

Last checked on 2026-09-01. Steam and Reddit players are reporting a possible NG+ problem where carrying Special Moonshine forward and then obtaining another copy can block the Baghead quest outcome they want. This is currently a community report, not an official confirmed achievement or trophy bug. The safe response is to avoid using destructive inventory edits, save deletion, forced cloud overwrites, or an extra NG+ cycle as a workaround. If you are chasing 100%, preserve the save, record platform and patch/version, and check the New Game Plus guide before interacting with another Special Moonshine pickup.

100% Completion Roadmap

For players aiming to unlock every achievement:\n\nPlaythrough 1:\n- Complete the main story.\n- Collect all Shells and weapons.\n- Find all map fragments.\n- Clear all optional dungeons and mini-bosses.\n- Experiment with different builds for combat achievements.\n- Decide whether Baghead or Special Moonshine outcomes matter before entering NG+, because current community reports suggest that duplicated quest inventory may be hard to unwind.\n\nNew Game Plus (if needed):\n- Some achievements may require NG+ for higher difficulty clears or repeated boss defeats.\n- Your map and Shell progress carries over, making collectible achievements easier.\n- Avoid picking up duplicate quest items only to test an unverified workaround.\n\nKeep a checklist and verify each achievement unlocks as you expect. If one fails, capture evidence before continuing.