Here is the full list of all 80 Astrea: Six-Sided Oracles achievements.
Reach max level with Sothis.
Reach Astrea's Heart with Sothis.
Reach max level with Austra.
Dodge 4 Corruption in a row.
Reach Astrea's Heart with Austra.
Reach max level with Hevelius.
Win a run with two Sentinels on max level.
Reach Astrea's Heart with Hevelius.
Reach max level with Cellarius.
Defeat Decayed Star.
Win a run without losing Hearts during battles. Sacrificing a Heart at Shrines doesn't count as Heart lost.
Reach Astrea's Heart with Cellarius.
Prevent a Heart loss using Wave.
Spend at least 1500 Star Shards in a single run.
Reach max level with Moonie.
Own a Sentinel on max level.
Defeat Corrupted Assembler.
Defeat a boss on the first turn.
Make an enemy defeat themselves.
Defeat Smoldering Beast.
Score at least 2000 points in a run.
Reach Astrea's Heart with Moonie.
Defeat Uncaged Anomaly.
Make a creature receive at least 100 Purify in a single Purify instance.
Forge a die.
Defeat Doomed Astronomer.
Play at least 10 dice in a single turn.
Defeat Sanctuary Parasite.
Acquire a Sentinel.
Win your first battle.
Save Meissa, the Antiquarian.
Score at least 3500 points in a run.
Score at least 7000 points in a run.
Reroll the same die at least 5 times in a single turn.
Win a run with 10 or fewer dice on your dice pool.
Win a run with at least 50 dice on your dice pool.
Win a run with only one type of dice other than Starter dice on your dice pool or with only Starter dice in your dice pool.
Win a run with at least 15 Blessings.
Win a run without owning any Sentinels.
Win a run without any Epic die on your dice pool.
Win a run without any Blessings.
Win a run at Anomaly Level 3.
Win a run at Anomaly Level 8.
Open Astrea's Heart.
Defeat the Corrupted version of yourself.
Defeat Corrupted Moonie.
Defeat Corrupted Cellarius.
Defeat Corrupted Hevelius.
Defeat Corrupted Austra.
Defeat Corrupted Sothis.
Defeat Corrupted Orion.
Defeat Astrea Avatar.
Defeat Astrea.
Defeat Astrea with all Oracles.
Defeat Astrea at Astrea Level 3.
Reach max level with all Oracles.
Obtain all other achievements.
Defeat Astrea with Moonie.
Enhance an enemy die.
Win a battle with at least 20 Plague Hex die in your dice pool.
Defeat Astrea with Cellarius.
Deal infinity Purify.
Play at least 20 virtues in a single turn.
Defeat Astrea with Hevelius.
Repair or Reactivate Sentinels at least 20 times in a single battle.
Have both your Sentinels with 4 types of Link.
Acquire 12 different type of Sentinels in a single run.
Defeat Astrea with Austra.
Deal 50 Purify with a Safe die.
Play a die with at least 50 Confuse on an Enemy without any Confuse percentage modifier.
Defeat Astrea with Sothis.
Have at least 20 Soul Heat.
Have at least 30 Chanting.
Have at least 4 creatures with at least 15 affliction.
Reach Astrea's Heart with Orion.
Defeat Astrea with Orion.
Reach max level with Orion.
Win a Ground Zero battle without moving your Orbs.
Move your Orbs 50 times in a single battle.
Activate Astrium 4 times in a single turn.