The Terracrypt Achievement Route I Use

Quick Answer

For the 15 Terracrypt-era achievements, I let most of the combat objectives follow normal progression.

The completion set is:

• collect Fusible Crystal, Shatter Core and Fission Mica Mineral;
• kill Mega Phiomia for Local Legend;
• defeat the 11 achievement bosses, beginning with Armoredrat and ending with Supervisor.

The three resource achievements are the ones I leave open for cleanup if they have not unlocked naturally. Their achievement text only confirms the required pickup, so I do not send myself to an unverified location.

PixARK’s Steam list contains 50 achievements in total, but only a smaller block belongs to the Terracrypt release period.

Steam splits these entries between the Terracrypt Expansion Pack label and Update #2, so I group them by what they actually ask me to accomplish instead:

3 resource pickups → Mega Phiomia → 11 boss defeats

That structure makes cleanup much easier. There are no hidden dialogue choices or weapon-specific boss challenges in the achievement descriptions I need to plan around. Most of the work overlaps naturally with progression.

The Three Resource Achievements

Three achievements only ask me to collect a specific Terracrypt material:

Fusible Crystal Collector
Collect Fusible Crystal.

Shatter Core Collector
Collect Shatter Core.

Fission Researcher
Collect Fission Mica Mineral.

The trigger text matters here because it says Collected, not crafted, delivered or used.

So once the correct item reaches me, there is no separate achievement step to perform afterward.

What I cannot verify reliably yet is a fixed acquisition route for any of the three materials.

I have not found enough consistent evidence to tell someone to travel to a specific biome, chest or coordinate and claim that route will produce the item. Terracrypt’s underground is large enough that a guessed location would be worse than leaving the objective open.

My practical approach is to watch for all three materials while progressing through the deeper areas. If Supervisor is dead and one of these achievements is still locked, I know exactly which pickup remains without replaying unrelated hunts or boss fights.

Local Legend Unlocks When Mega Phiomia Dies

Local Legend is tied to the village hunting progression.

The condition is:

Successfully hunted Mega Phiomia.

This is useful because Mega Phiomia feels like a major boss encounter during the village chain, but it is not one of the 11 boss-defeat achievements.

The unlock also happens at the kill itself.

When Mega Phiomia went down, Local Legend appeared immediately, before I returned to finish the surrounding quest turn-in.

That gives me an easy check.

If the notification appeared, the achievement portion of the hunt is finished.

The actual route through the village hunting chain belongs in the Terracrypt walkthrough.

Tunnel Buster Starts the 11 Boss Achievements

The first boss achievement is:

Tunnel Buster — defeat Armoredrat

Its description calls defeating Armoredrat:

the first step to victory

That is the clearest point where the main boss-achievement set begins.

The achievement itself only needs the kill. Armoredrat’s level 40 preparation, head weak point, returning armor and ammunition pressure are handled in the Terracrypt boss guide.

Once Tunnel Buster appears, I mark Armoredrat complete and keep the remaining boss names on the same checklist.

The 11 Boss Achievement Checklist

The full set is:

1. Tunnel Buster — defeat Armoredrat
2. Venom Recycler — defeat Largespider
3. Cobalt Star General — defeat Cobaltstarsaeki
4. Mechanical Terminator — defeat Mechanicalworm
5. Frost Sentinel — defeat Fenrir
6. Blaze & Sky Monarch — defeat Firebat
7. Wild Science Overlord — defeat Crazydoctor
8. Queen Slayer — defeat Queenhornet
9. Onyx Wings — defeat Venerthorn
10. Immune to All Poisons — defeat Venom
11. Origin Savior — defeat Supervisor

Every one of these descriptions uses the boss defeat itself as the achievement condition.

There is no listed requirement to finish with a particular weapon, avoid damage, beat a timer or use an elemental effect.

That matters when preparing for a fight. I can use whichever setup makes the boss reliable without worrying that a safer strategy will invalidate the achievement.

Supervisor Marks the Final Boss Objective

The last achievement in the boss set is:

Origin Savior

Its description begins:

Final battle! Successfully defeated Supervisor.

That makes Supervisor the confirmed endpoint of the boss completion route.

If Origin Savior unlocks but my Terracrypt set is still incomplete, I can narrow the remaining work down quickly.

It will be one of three things:

• Fusible Crystal, Shatter Core or Fission Mica Mineral;
• Local Legend from Mega Phiomia;
• an earlier boss achievement that never registered or was never completed.

I do not need to restart the whole checklist from the beginning.

The Cleanup Route That Saves Me the Most Backtracking

During the main run, I let Mega Phiomia and the boss achievements unlock when progression reaches them.

The three resource pickups stay visible in the back of my mind, but I do not abandon a clear quest route to search random caves for a material whose reliable source I have not confirmed.

By the time the campaign reaches Supervisor, most of the combat portion should already be resolved.

Then the Steam list becomes a diagnostic tool:

Local Legend missing means Mega Phiomia still needs attention.

One boss achievement missing tells me exactly which named target remains.

One of the three collection achievements missing means my cleanup is a resource problem, not a combat problem.

That is the point where achievement tracking becomes useful instead of distracting from progression.