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