Here is the full list of all 31 Lifeslide achievements.
Clear the entire game without dying
Pass "Loving" without collecting any particles
Play with all planes
Unlock all planes
Maximum improvements
Reach maximum speed
Find the hidden spot in "Fighting"
Find the hidden spot in "Understanding"
Find the hidden spot in "Giving"
Find the hidden spot in "Creating"
Find the hidden spot in "Healing"
Find the hidden spot in the "Revealing"
Pass "Fighting" with the third plane
Regain time after it runs out quickly, three times in a row
Travel 10,000 in one run units on Zen
Complete the game
Reach the final realm
Collect 10,000 in total
Reach Maturity
Find the hidden spot in "Loving"
Use Knowledge 30 times
Reach Adulthood
Find the hidden spot in "Awakening"
Reach the realm of healing and dreams
Reach the realm of growing up
Regain time after it runs out
Make your first improvement
Brought to life
Reach the realm of imagination
Use three Will power-ups in a quick succession
Whilst holding a power-up, collect a different power-up