The Expanse: A Telltale Series

Finish Episode 1. Story-unmissable - just complete the episode.

Finish Episode 2.

Episode 2: interact with the music box near the brig to listen to Maya's Martian music - easy to walk straight past.

Finish Episode 3.

Episode 2: hand Virgil the mushroom powder in the kitchen.

Episode 2: give Khan the cigar and hear her story. A step toward Khan's Revenge.

Finish Episode 4.

Complete all five episodes - unlocks as you finish Oyedeng, Kopengs. The story cap.

Episode 4: in the mine section with the three drones, reach the far side without being spotted. A one-shot stealth run - replay Episode 4 if you trip an alarm.

Finish Episode 5, the finale.

Episode 1: collect the laser crystal scavenge item out on the ship's exterior - it goes to Virgil. Also a prerequisite for Khan's Revenge, so don't skip it.

Episode 2: hack Virgil's computer (you need the data-hack cube scavenge item) to uncover the truth about his past.

Keep Cox alive. Ep1: throw Cox in the brig, not the airlock. Ep2: give him the scotch (Bottoms up!). He then survives the Episode 5 fight. Part of the No Belter Left Behind chain.

Episode 2: grab the bottle of scotch from Cox's quarters and take it to Cox in the brig. Also a step toward keeping him alive (Call it Even).

Hidden. Episode 5: help Virgil through his panic attack - reassure him (the "things are bad but we've seen worse" / "you can go back to being our medic" line) and stay with him. Part of the No Belter Left Behind sweep.

Collect all 6 Data Logs in Episode 1 before finishing it. No rewind, so grab them on the way (or replay the episode). Feeds Data Collector.

Both Data Logs in Episode 5 (only 2). No scavenge items in Ep5.

Keep Khan alive. Ep1: get the laser crystal (Doctor Approved). Ep2: give Khan the cigar (Stogie for Fogey). Ep5: pass every QTE in the pirate fight at her side - the one-shot timed part. Part of No Belter Left Behind.

Episode 2: leave the medicine on the mess-hall table for the sleeping twins.

Archangel story: meditate at the Buddha statue - it's interactable for most of the episode, so hard to miss if you explore.

Archangel story: solve the sliding desk puzzle to get the key, then open the Secretary-General's safe.

Complete the bonus Archangel story (the Drummer prequel) - just play it through. It's also where the Zen Master, Keep Arjun in Check, Safe Cracker and Master Negotiator interactions live.

Keep Maya alive via the Rayen-loyalty path. Ep1: break up the Arlen/Rayen fight and save Rayen's leg. Ep2: give the twins medicine and sleep with Maya. Ep3: trust Rayen. Ep5: save Rayen. Part of No Belter Left Behind, and the same chain that triggers Brother's Reaper.

Archangel story: play chess against Arjun - make a move in each of the three chess stages, not just one.

All 5 Data Logs in Episode 2.

Archangel story: defeat Mendez's motion on the first try by picking the right opposing voters on the three policy positions (tax, deregulation, the water tower). Get the picks right first time or you'll need to replay Archangel.

All 8 Scavenge Items in Episode 2.

The umbrella crew-survival cheevo - keep every possible crewmate alive. It's an interdependent chain across all five episodes, so follow a survival checklist; completing it pops alongside Call it Even, Khan's Revenge, Miraculous Maya, Heal Thy Medic and Brother's Reaper. One missed early step (the Ep1 laser crystal, the brig choice) quietly locks a later survival, so get them right or replay from that episode.

All 8 Scavenge Items in Episode 1. Heads-up: this one has reports of not unlocking even with all 8 collected - some players only got it to pop on a fresh save file. If it sticks, replaying Episode 1 (or a clean save) has worked for others. Feeds Scavenger Star.

All 4 Data Logs in Episode 3.

Hidden. Follow the Rayen-loyalty chain - save Rayen's leg (Ep1), build trust through Ep2-3, then trust and save Rayen - and Rayen kills Arlen at the climax. There's no opposing achievement and it's not mutually exclusive with anything, so it sits naturally with Miraculous Maya and No Belter Left Behind.

All 8 Scavenge Items in Episode 3 - the last episode with scavenge items (Ep4-5 have none).

All 4 Data Logs in Episode 4. Episode 4 has no scavenge items, so logs are the only thing to hunt here.

Find all 24 Scavenge Items - every one is in Episodes 1-3 (8 each); Ep4-5 have none. Pops once you've cleared Urshanabi Hoarder, Debris Spree and Grave Robber.

Find all 21 Data Logs across the five episodes (6/5/4/4/2). Pops once you've cleared every episode's logs - see Data Logger onward.