Mortal Shell II Achievements

The researched retail lists show 52 shared achievement objectives on Steam and Xbox, while PlayStation has 53 trophies because it adds the “No Lifer” Platinum. Plan around story progress, weapons, sidearms, Shells, collectibles, bosses, and a small group of special challenge conditions. Keep the older Open Beta achievement list separate.

Platform totals

AllThings.How lists 53 PlayStation trophies and 52 objectives on Xbox and Steam. The extra PlayStation entry is the Platinum awarded after the other trophies. Achievement names and platform display can vary, but the underlying non-Platinum objectives are presented as corresponding.

Always check your platform list after patches. This guide organizes the researched release set rather than reproducing an old demo checklist. Beta achievements such as completing the test are historical and do not replace retail completion goals.

Story and progression

Early objectives introduce claiming a Shell, weapon, and sidearm, reaching Marrowkeep, and watching a Shell Memory. The completion objective is tied to finishing Mortal Shell II. Story-related names can reveal progression context, so readers avoiding spoilers should use category headings without opening boss detail.

One third-party roadmap warns about tutorial-linked conditions and a specific boss parry challenge. Treat those as early planning warnings rather than official guarantees, and preserve a manual save or platform backup only through methods allowed by your system.

Weapons and sidearms

Individual pickup trophies cover named primary weapons and sidearms, while “Lord of War” and “Guns. Lots of Guns” track the complete category collections. Source categorization is inconsistent for Caged Hystrix and Salvaged Trebuchaxe, so follow the in-game achievement text and the release weapon database.

Track eight primary weapons and eight sidearms, including the prologue gear. Group world pickups by region, key, and dungeon so a completion run avoids repeated travel. The weapon hub links the Chapel Key, Shrine of Trials, and Proxima-related routes.

Shell objectives

The list includes trophies for the eight long-term Shells and “Shell Seeker” for collecting them. “Decked Out” is connected with reaching a maximum bonding tier, while “Seeking the Past” requires Shell Memory progress according to the researched guides.

A completion roadmap says memory work can extend across additional progression because the relevant upgrade currency is limited per run. That playthrough estimate is third-party guidance, not an official minimum. Spend only after comparing the requirements with your current save.

Exploration and collectibles

The release lists include all Beacons, Map Fragments, Tarstones, Ova, Lute Tracks, and Shell Memories. These categories are easier to manage with separate checklists than one enormous unsourced map. Mark an item only after the game registers it.

The third-party roadmap reports that many collection objectives remain available before entering New Game+, even after the final boss. Confirm the actual point-of-no-return prompt in your build rather than assuming you can return after accepting a transition.

Boss trophies

Named hidden trophies cover major boss defeats. Hidden status protects spoilers on platform interfaces, but external lists reveal their names. This page does not put the full boss table in the opening answer for that reason.

One special condition, “Peter’s Perfect Parry,” is described as requiring every headspin in a named boss sequence to be perfectly guarded with the Untarnished Seal. Because this is detailed third-party guidance, open the full source and verify the current patch before the attempt.

Unusual and potentially missable tasks

The researched roadmap marks “Mid Summer?”, “No, You Still Can’t Win,” and “Peter’s Perfect Parry” as missable. It also describes hidden interactions for “Ascension,” “Bag Holder,” and “Feed Me.” These labels come from a completion guide, not the platform’s official trophy description.

The safest approach is to review the missable section before leaving the tutorial and before the relevant boss. Avoid equipping or selecting anything a current guide identifies as disabling trophies until you have confirmed the effect in your build.

Recommended completion order

First complete tutorial-only conditions. During the main run, defeat trophy bosses and collect items naturally while keeping category notes. Before any New Game+ transition, clean up Beacons, maps, weapons, sidearms, Shells, Tarstones, and special interactions that remain accessible.

Then evaluate Shell bonds and memories. If the source’s multi-run resource warning applies to your save, prioritize upgrades that advance remaining memory objectives instead of spreading currency without a plan.

Save and point-of-no-return discipline

Before a tutorial exit, major boss, or New Game+ confirmation, review the remaining special conditions. Use only save backup features supported by your platform and account. Never download another player’s save or disable platform protections simply to avoid a replay.

After a boss, confirm that the achievement actually registered before continuing. A successful combat animation may not satisfy a condition that requires a particular Seal, every hit in a sequence, or an interaction after the fight.

Resolving source conflicts

When a third-party table places an item in the wrong category, check the release inventory and platform achievement wording. When a roadmap calls something missable, read the detailed reason: a tutorial-only event is different from a collectible that remains available until New Game+.

Do not merge totals from PlayStation, Steam, the Open Beta, and Xbox into one number. The Platinum explains the one-entry difference in the researched retail lists.

Completion checklist

• Retail list selected for the correct platform.
• Tutorial and boss-condition warnings reviewed.
• Eight primary weapons and eight sidearms tracked separately.
• Eight long-term Shells and their memory progression tracked.
• Beacons, maps, Tarstones, Ova, and Lute Tracks have individual lists.
• Final cleanup completed before accepting New Game+.
• Every unlocked condition is confirmed by the platform interface.

This structure keeps a long completion project auditable and prevents a missing objective from being buried in a single unchecked “100%” note.

Sources

• PowerPyx trophy list
• AllThings.How achievement guide
• 100% Guides roadmap

Last updated: 2026-08-23