Full list of all 18 Phantom Abyss achievements worth 1,000 gamerscore. It takes around 25-30 hours to unlock all of the achievements on Xbox Series X|S.
Claim a relic in The Ruins
Claim a relic in The Caverns
Claim a relic in The Inferno
First death in a temple
First Relic
Purchase a blessing
Reach Divine rank 3 in Adventure Mode
Prestige a whip
Unlock all tier 1 whips
Unlock all tier 2 whips
Unlock all tier 3 whips
Prestige all tier 1 whips
Prestige all tier 2 whips
Prestige all tier 3 whips
Own all relics from The Ruins
Own all relics from The Caverns
Own all relics from The Inferno
Break 3 chains binding Altec in The Abyss