Here is the full list of all 38 Returnal achievements. It takes around 40-50 hours to unlock all of the achievements on Windows.
Collect all main Achievements
Gain a moment of peace
Kill 100 Hostiles with Disgorgers
Open the Locked Door
Defeat Algos' final form
Finish Act 3
Finish Overgrown Ruins Survey
Finish Crimson Wastes Survey
Finish Echoing Ruins Survey
Finish Fractured Wastes Survey
Finish Abyssal Scar Survey
Complete all House sequences
Achieve Weapon Proficiency level 30
Defeat Algos' first form
Complete the first Hospital sequence
Finish Derelict Citadel Survey
Complete a daily challenge in Simulation Mode
Finish Act 2
Defeat Ophion
Achieve 200% Max Integrity
Defeat Hyperion
Die and return in the Tower
Finish Act 1
Defeat Nemesis
Complete a Xeno-archive set (excluding Tower of Sisyphus)
Finish Calculated Risk
Have 5 Parasites simultaneously
Defeat Ixion
Retrieve 10 Scout Logs
Defeat Phrike
Returned by an Artifact
Achieve maximum Adrenaline Level
Unlock all translation tiers of a Xenoglyph
Complete the first House sequence
Perform 5 successful Overloads in a row
Learn the basics of survival on Atropos
Scan a Xenoglyph
Experience a new cycle after death