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