Here is the full list of all 80 Astrea: Six-Sided Oracles achievements.
Defeat Corrupted Sothis.
Dodge 4 Corruption in a row.
Defeat Corrupted Orion.
Score at least 3500 points in a run.
Win a run with at least 15 Blessings.
Defeat Astrea with Cellarius.
Defeat Astrea.
Defeat Astrea Avatar.
Prevent a Heart loss using Wave.
Enhance an enemy die.
Defeat the Corrupted version of yourself.
Defeat Corrupted Moonie.
Open Astrea's Heart.
Reach Astrea's Heart with Orion.
Spend at least 1500 Star Shards in a single run.
Make a creature receive at least 100 Purify in a single Purify instance.
Win your first battle.
Acquire a Sentinel.
Forge a die.
Own a Sentinel on max level.
Defeat Sanctuary Parasite.
Defeat Smoldering Beast.
Defeat Doomed Astronomer.
Defeat Corrupted Assembler.
Defeat Decayed Star.
Defeat Uncaged Anomaly.
Defeat a boss on the first turn.
Score at least 2000 points in a run.
Play at least 10 dice in a single turn.
Win a run without losing Hearts during battles. Sacrificing a Heart at Shrines doesn't count as Heart lost.
Reach Astrea's Heart with Moonie.
Reach Astrea's Heart with Cellarius.
Reach Astrea's Heart with Hevelius.
Reach Astrea's Heart with Austra.
Reach Astrea's Heart with Sothis.
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 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 3.
Win a run at Anomaly Level 8.
Defeat Corrupted Cellarius.
Defeat Corrupted Hevelius.
Defeat Corrupted Austra.
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.
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.
Defeat Astrea with Hevelius.
Reach max level 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.
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.
Defeat Astrea with Sothis.
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.