Mechanics

Everything is Crab Achievement Trigger Guide: Codex Tags, Pressure, Extinction

Some achievements are not universal single-run checks. The Codex tag decides whether the credit must happen in Pressure runs, Extinction, or Challenges, so this page separates mode rules from total-damage, single-hit, and boss conditions.

Practical use

  1. Open the specific achievement in the in-game Codex before routing around a screenshot or damage number.
  2. Keep the counters separate: Brute, Bruter, and Brutest use total run damage, while Ultrabonk uses the maximum eligible single hit.
  3. If the Codex entry says Pressure runs, the credit must happen before Extinction or Endless rather than after the transition.
  4. A post-1.2 Pressure 12 run reached Extinction 12 with Whiplash, about 500% Feeding Speed, roughly 4,000 per hit, and more than 50,000 total damage, but the player reports that the 500-hit, 35,000-total, and 50,000-total achievements did not unlock after the transition. Treat this as fresh evidence for completing Pressure-tagged thresholds before choosing Endless, not as proof that Projectile Tongue is broken.
  5. If the entry explicitly says Extinction or Challenges, those modes can award the achievement there.
  6. Recent Brute-line, Ultrabonk, and It was a dinosaur confusion all point back to the same first check: current patch version plus the exact Codex mode tag.
  7. When reporting a suspected bug, keep the Codex requirement, the end screen, and the relevant total-damage, max-hit, or boss screenshot together.

Achievement trigger checklist

What the Codex saysWhat it meansWhat to verify
Pressure runsThe credit must happen before the run transitions into Extinction or Endless.Do not use a later Extinction screenshot as proof for a Pressure-only tag.
ExtinctionThe achievement can trigger in an Extinction segment when the stated condition is met there.Keep the end screen or screenshot that shows the Extinction context.
ChallengesChallenge mode can award it, but only when the achievement specifically names Challenges.Do not assume a normal-run achievement will credit inside a challenge unless the Codex says so.
Unsure or buggedCheck live patch notes first, because 1.1.2 specifically fixed at least one achievement-credit issue.Keep the Codex requirement, patch version, and result screen together before reporting it.

The recent public developer clarification was simple: the exact Codex tag decides whether a huge hit or boss kill happened in the right mode. Players should verify the tag before rebuilding the whole route.

Related pages

Beginner First Clear

A conservative first-clear route for players who feel stuck on the first level or early Pressure climbs: stabilize food, movement, regeneration, and one simple damage plan before chasing fancy branches.

Read guide

Physical Predator

Direct-contact damage, meat routing, and Physical scaling for players who want bosses to end quickly instead of becoming endurance checks.

Read guide

Poison Trickster

Ability-scaling poison, Stinger routing, and ranged uptime. This route wins by applying damage safely and letting status ticks finish what raw burst cannot.

Read guide

Vegan Pacifist

No-damage, no-hit, and low-violence routing built around normal-run eligibility, food access, Prey affinity, boss outlasting, and avoiding player-owned damage sources.

Read guide