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