Here is the full list of all 86 Astral Ascent achievements.
Unlock Calie’s ending
Reach level 12
Defeat 30 Star Guardians
Defeat Cancer at Destiny Level 6+
Open 150 Key Chests
Defeat Sagittarius at Destiny Level 6+
Success an escape at Destiny Level 15+
Unlock Kiran’s ending
Collect 100 Destiny Fragments
Defeat Capricorn at Destiny Level 6+
Defeat Gemini at Destiny Level 6+
Perfect 30 Fight Rooms
Defeat Scorpio at Destiny Level 6+
Defeat Taurus at Destiny Level 6+
Complete 50% of Sire Bapy’s achievements
Unlock Octave’s ending
Defeat The Master at Destiny Level 6+
Defeat Aquarius at Destiny Level 6+
Defeat Pisces at Destiny Level 6+
Defeat Leo at Destiny Level 6+
Use your Signature Spell 500 times
Defeat Virgo at Destiny Level 6+
Defeat Cancer
Defeat Aquarius
Save all Yalees from the Kingdom
Use 200 Stars in a run
Defeat Sculptor
Obtain 1000 Quartz in a run
Defeat Aries
Upgrade a spell to level 10
Captured 5 Astral Spirits
Unlock Calie
Equip 4 affinity gambits on a spell
Equip a Zodiac Spell in The Moon Room
Defeat Scorpio
Defeat Leo
Defeat Draco
Change a Spell affinity in The Sun Room
Defeat Virgo
Unlock Octave
Defeat Lupus
Unlock Oloon
Unlock Papa Yalee
Unlock Barbecue
Unlock the Path of Destiny
Start 30 escape attempts
Unlock Sire Bapy
Face The Master
Reach the Event Horizon
Defeat Gemini
Defeat Pegasus
Reach the Crimson Highlands
Reach 1000 damage in one combo
Defeat Pisces
Summon a Zodiac to support you
Equip an Astral Gambit
Defeat Hydra
Meet Chamaeleon
Reach the Coral Archipelago
Defeat Sagittarius
Defeat Monoceros
Defeat Capricorn
Unlock the Peddler
Success a Zodiac Challenge
Unlock Zim-Zim
Reach the Red Barrens
Defeat Taurus
Equip an Astral Aura
Reach the Garden
Buy all items from an Itinerant Peddler
Obtain 5 Echoes in a run
Your Zodiac sign helps you 3 times
Trigger 12 dialogues on Benches
8 stones of each type equipped simultaneously
Unlock all Zim-Zim abilities
Unlock all Auras from Barbecue
Unlock all spells from the Peddler
Unlock all Oloon colors
Collect all memory fragments for Papa Yalee
Find the hidden nest in the Garden
Defeat Libra
Defeat Aries at Destiny Level 6+
Defeat Libra at Destiny Level 6+
Activate all abilities of the Void Catalyst at once
Upgrade a spell to level 15
Unlock Ayla’s ending