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