Here is the full list of all 80 Astrea: Six-Sided Oracles achievements.
Defeat Astrea with Sothis.
Defeat the Corrupted version of yourself.
Have at least 30 Chanting.
Defeat Astrea with Austra.
Defeat Corrupted Sothis.
Defeat Astrea with Hevelius.
Defeat Corrupted Orion.
Repair or Reactivate Sentinels at least 20 times in a single battle.
Spend at least 1500 Star Shards in a single run.
Defeat Corrupted Hevelius.
Defeat Astrea with Cellarius.
Score at least 3500 points in a run.
Defeat Astrea.
Defeat Astrea with Moonie.
Defeat Astrea Avatar.
Defeat Corrupted Cellarius.
Open Astrea's Heart.
Reach Astrea's Heart with Orion.
Reach Astrea's Heart with Hevelius.
Reach Astrea's Heart with Sothis.
Reach Astrea's Heart with Austra.
Make a creature receive at least 100 Purify in a single Purify instance.
Save Meissa, the Antiquarian.
Win your first battle.
Acquire a Sentinel.
Forge a die.
Defeat Sanctuary Parasite.
Defeat Smoldering Beast.
Defeat Doomed Astronomer.
Defeat Corrupted Assembler.
Defeat Decayed Star.
Defeat Uncaged Anomaly.
Score at least 2000 points in a run.
Play at least 10 dice in a single turn.
Reach Astrea's Heart with Moonie.
Enhance an enemy die.
Reach Astrea's Heart with Cellarius.
Own a Sentinel on max level.
Defeat a boss on the first turn.
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 without losing Hearts during battles. Sacrificing a Heart at Shrines doesn't count as Heart lost.
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 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.
Defeat Corrupted Moonie.
Defeat Corrupted Austra.
Defeat Astrea with all Oracles.
Defeat Astrea at Astrea Level 3.
Reach max level with all Oracles.
Obtain all other achievements.
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.
Prevent a Heart loss using Wave.
Deal infinity Purify.
Play at least 20 virtues in a single turn.
Reach max level with Hevelius.
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.
Dodge 4 Corruption in a row.
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 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.