Full list of all 57 RUN: The world in-between achievements.
The base game contains 49 achievements, and there is 1 DLC pack containing 8 achievements.
Dying after the first step
Dash 100 times
Bounce 100 times on bouncers
Jump 100 times
Dash 300 times
Jump 300 times
Dash 1000 times
Jump 1000 times
Fill the first orb
Fill the second orb
Fill the third orb
Fill the fourth orb
Fill the fifth orb
Fill the sixth orb
Fill the last orb
Do a PowerDash for the first time
The first death into a pit
The first meeting with Sorghal
Unlock Brutal mode by finishing Normal mode
Unlock Infernal mode by finishing Brutal mode
Unlock Nightmare mode by finishing Infernal mode
Unlock Infinite mode by finishing Normal mode
Unlock Speedrun mode by finishing Normal mode
Reach the end of Nightmare mode and therefore... the end of the game.
Collect 5 gems
Achieve 20 runs on the same savefile and see the Red Stone on the Stele
Win 5 consecutive runs
Win 10 consecutive runs
Win 25 consecutive runs
Make the bird hidden in the clouds fly again
The loss of a loved one...
...
Win 35 runs on the same savefile
Complete the game without dying
Die 50 times
Die 500 times
Die 1000 times
Travel 10 km
Travel 50 km
Parcourir 100 km
Score 15 in Infinite mode
Score 30 in Infinite mode
Score 50 in Infinite mode
Finish Speedrun mode in less than 45min
Finish Speedrun mode in less than 35min
Complete story mode in Nightmare on the 3 save slots
Collect 100 gems before finishing the game
Win 50 consecutive runs
Finish Speedrun mode in less than 25min
Score 150 in Infinite mode
Score 125 in Infinite mode
Score 100 in Infinite mode
Attempt Infinite mode 100 times in a row
Scare both birds in a limited time