Here is the full list of all 80 Astrea: Six-Sided Oracles achievements.
Acquire a Sentinel.
Defeat Smoldering Beast.
Win your first battle.
Save Meissa, the Antiquarian.
Forge a die.
Spend at least 1500 Star Shards in a single run.
Own a Sentinel on max level.
Defeat Sanctuary Parasite.
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.
Score at least 3500 points in a run.
Score at least 7000 points in a run.
Play at least 10 dice in a single turn.
Reroll the same die at least 5 times in a single turn.
Make a creature receive at least 100 Purify in a single Purify instance.
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.
Open Astrea's Heart.
Defeat the Corrupted version of yourself.
Defeat Corrupted Moonie.
Defeat Corrupted Cellarius.
Defeat Corrupted Hevelius.
Defeat Corrupted Austra.
Defeat Corrupted Sothis.
Defeat Corrupted Orion.
Defeat Astrea Avatar.
Defeat Astrea.
Defeat Astrea with all Oracles.
Defeat Astrea at Astrea Level 3.
Reach max level with all Oracles.
Obtain all other achievements.
Reach Astrea's Heart with Moonie.
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 Astrea's Heart with Cellarius.
Defeat Astrea with Cellarius.
Reach max level with Cellarius.
Prevent a Heart loss using Wave.
Deal infinity Purify.
Play at least 20 virtues in a single turn.
Reach Astrea's Heart with Hevelius.
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.
Reach Astrea's Heart with Austra.
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.
Reach Astrea's Heart with Sothis.
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 Astrea's Heart with Orion.
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.