Mortal Shell II Achievement Guide

The released Mortal Shell II has 53 Steam achievements, verified against Steam's current achievement list on September 9, 2026. The old nine-entry Open Beta checklist does not describe the full game's achievement set.

Verified progression and collection goals

These selected objectives use the current Steam names; they are not a complete 53-entry checklist.

| Achievement | Verified objective | | --- | --- | | Home at Last | Arrive at Marrow Keep. | | Forever Alone? | Acquire Tiel as a playable Shell. | | Deep Cuts | Acquire the Axe and Dagger weapon. | | Sat Nav | Collect every map fragment. | | So Fresh, So Clean | Finish cleansing the entire Beacon network. |

Steam also lists objectives for collecting the complete sets of Shells, weapons, sidearms, Ova, and Tarstones; viewing every Shell Memory; finishing the campaign; and completing all achievements. Hidden entries on the public list do not expose their requirements. Those conditions, difficulty restrictions, and a reliable missables checklist remain unverified here.

Organize your completion run

Opening and first unlocks

Start with arrival at Marrow Keep, then track your first optional Shell and weapon acquisitions. The table above gives current names for these early goals. Use Tiel’s entry and Axe and Dagger for the existing acquisition guidance.

Equipment and upgrades

Keep separate lists for Shells, primary weapons, and sidearms so that collecting one category does not obscure gaps in another. Steam also has upgrade objectives for reaching a Shell’s highest bonding tier and fully improving a weapon at the Tarforge. The weapons hub helps you compare equipment before investing resources.

Exploration and memories

Track map fragments, Beacon cleansing, Ova, Tarstones, and Shell Memories separately. Finding a travel point is not the same task as completing its cleansing objective. Follow the Beacon routes and revisit your own checklist after each dungeon.

Campaign and hidden objectives

Campaign completion and unlocking every achievement are separate goals. Some public Steam entries hide their requirements. No hidden boss condition, ending choice, difficulty rule, or missable route is assumed here; use your in-game tracker to identify what remains before committing to an ending.

Plan your playthrough

Use the walkthrough to reach the hub, then keep your in-game achievement tracker open when choosing optional objectives. Check an unlock against the current Steam entry before repeating a route from an older guide.

The Shell database and weapon database organize the existing acquisition notes. For navigation, use the Fast Travel and Beacon Guide. Record which destinations you have visited and which cleansing objectives you have completed separately, so you can identify unfinished stops later.

This guide does not yet provide a verified location-by-location route for every collectible. It also does not establish whether every objective can be cleaned up after the ending. Avoid treating an incomplete checklist as proof that a completion run is safe to finish.

Historical Open Beta differences

The previous version of this page covered a separate Beta checklist, including a seven-Beacon target and a Beta-ending objective. Those counts and endpoints must not be used for a full-game completion run. Beta-only Tar Golem retry tricks, trial workarounds, and Seal restrictions have been removed because they have not been verified for the released version.