Here is the full list of all 80 Astrea: Six-Sided Oracles achievements.
Win a run at Anomaly Level 3.
Defeat Astrea with Sothis.
Dodge 4 Corruption in a row.
Reach max level with Hevelius.
Prevent a Heart loss using Wave.
Defeat a boss on the first turn.
Defeat Corrupted Orion.
Win a run with two Sentinels on max level.
Defeat Astrea with Austra.
Defeat Corrupted Moonie.
Defeat Astrea with Hevelius.
Defeat Corrupted Austra.
Score at least 3500 points in a run.
Defeat Astrea with Cellarius.
Defeat Astrea.
Defeat Astrea Avatar.
Defeat Corrupted Sothis.
Open Astrea's Heart.
Reach Astrea's Heart with Moonie.
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 Hevelius.
Own a Sentinel on max level.
Defeat Decayed Star.
Reach Astrea's Heart with Sothis.
Score at least 2000 points in a run.
Reach Astrea's Heart with Austra.
Make a creature receive at least 100 Purify in a single Purify instance.
Spend at least 1500 Star Shards in a single run.
Reach Astrea's Heart with Cellarius.
Defeat Doomed Astronomer.
Defeat Uncaged Anomaly.
Defeat Smoldering Beast.
Play at least 10 dice in a single turn.
Defeat Corrupted Assembler.
Forge a die.
Defeat Sanctuary Parasite.
Acquire a Sentinel.
Win your first battle.
Save Meissa, the Antiquarian.
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 8.
Defeat the Corrupted version of yourself.
Defeat Corrupted Cellarius.
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 Moonie.
Reach max level with Moonie.
Enhance an enemy die.
Make an enemy defeat themselves.
Win a battle with at least 20 Plague Hex die in your dice pool.
Reach max level with Cellarius.
Deal infinity Purify.
Play at least 20 virtues in a single turn.
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.
Reach max level 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.
Reach max level with Sothis.
Have at least 20 Soul Heat.
Have at least 30 Chanting.
Have at least 4 creatures with at least 15 affliction.
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.