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