Here is the full list of all 80 Astrea: Six-Sided Oracles achievements.
Reach max level with Cellarius.
Defeat Astrea with Cellarius.
Reach max level with Moonie.
Defeat Astrea with Moonie.
Reach max level with Austra.
Defeat Astrea with Austra.
Defeat Corrupted Cellarius.
Dodge 4 Corruption in a row.
Reach max level with Hevelius.
Defeat Astrea with Hevelius.
Win a run with two Sentinels on max level.
Defeat Corrupted Moonie.
Score at least 7000 points in a run.
Defeat Astrea at Astrea Level 3.
Have at least 20 Soul Heat.
Reach max level with Sothis.
Win a run at Anomaly Level 3.
Defeat the Corrupted version of yourself.
Defeat Corrupted Sothis.
Defeat Corrupted Hevelius.
Score at least 3500 points in a run.
Defeat Astrea with Sothis.
Defeat Astrea.
Defeat Astrea Avatar.
Defeat Corrupted Orion.
Open Astrea's Heart.
Reach Astrea's Heart with Orion.
Win a run with at least 15 Blessings.
Reach Astrea's Heart with Sothis.
Defeat Uncaged Anomaly.
Defeat a boss on the first turn.
Reach Astrea's Heart with Austra.
Spend at least 1500 Star Shards in a single run.
Own a Sentinel on max level.
Make a creature receive at least 100 Purify in a single Purify instance.
Win a run without losing Hearts during battles. Sacrificing a Heart at Shrines doesn't count as Heart lost.
Reach Astrea's Heart with Cellarius.
Reach Astrea's Heart with Hevelius.
Defeat Corrupted Assembler.
Score at least 2000 points in a run.
Reach Astrea's Heart with Moonie.
Defeat Decayed Star.
Defeat Doomed Astronomer.
Play at least 10 dice in a single turn.
Defeat Sanctuary Parasite.
Forge a die.
Acquire a Sentinel.
Defeat Smoldering Beast.
Win your first battle.
Save Meissa, the Antiquarian.
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 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 Austra.
Defeat Astrea with all Oracles.
Reach max level with all Oracles.
Obtain all other achievements.
Enhance an enemy die.
Make an enemy defeat themselves.
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.
Deal 50 Purify with a Safe die.
Play a die with at least 50 Confuse on an Enemy without any Confuse percentage modifier.
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.