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