Here is the full list of all 80 Astrea: Six-Sided Oracles achievements.
Reach max level with Cellarius.
Defeat Corrupted Cellarius.
Reach max level with Hevelius.
Defeat Corrupted Sothis.
Win a run at Anomaly Level 3.
Defeat Astrea at Astrea Level 3.
Make an enemy defeat themselves.
Defeat Corrupted Austra.
Defeat Astrea with Orion.
Make a creature receive at least 100 Purify in a single Purify instance.
Defeat Corrupted Orion.
Win a run with at least 15 Blessings.
Defeat Astrea with Moonie.
Defeat Astrea with Hevelius.
Defeat the Corrupted version of yourself.
Defeat Corrupted Hevelius.
Score at least 3500 points in a run.
Defeat Astrea with Cellarius.
Defeat Astrea.
Defeat Astrea Avatar.
Defeat Corrupted Moonie.
Open Astrea's Heart.
Reach Astrea's Heart with Orion.
Spend at least 1500 Star Shards in a single run.
Reach Astrea's Heart with Austra.
Defeat Decayed Star.
Reach Astrea's Heart with Sothis.
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.
Defeat Corrupted Assembler.
Own a Sentinel on max level.
Reach Astrea's Heart with Cellarius.
Defeat Smoldering Beast.
Score at least 2000 points in a run.
Reach Astrea's Heart with Moonie.
Defeat Uncaged Anomaly.
Defeat Doomed Astronomer.
Forge a die.
Play at least 10 dice in a single turn.
Defeat Sanctuary Parasite.
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.
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 8.
Defeat Astrea with all Oracles.
Reach max level with all Oracles.
Obtain all other achievements.
Reach max level with Moonie.
Enhance an enemy die.
Win a battle with at least 20 Plague Hex die in your dice pool.
Prevent a Heart loss using Wave.
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.
Defeat Astrea with Austra.
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.
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.
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.