Here is the full list of all 28 FrostRunner achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Get the fast time on all levels in Chapter 3 - Tether
Used fling for the first time
Finished Chapter 3 - Tether
Tethered for the first time
Finished Chapter 2 - Ice
Get the fast time on all levels in Chapter 2 - Ice
Finished Chapter 1 - Ring
Get the fast time on all levels in Chapter 1 - Ring
Died for the first time
Get the fast time on all Prologue levels
Finished the Prologue
Found a collectible
Jumped for the first time - Feel proud!
Obtain an achievement...see what we did there?
Took your first steps
Finished Chapter 4 - Fling
Finished Chapter 5 - Chain
Get the fast time on all levels in Chapter 4 - Fling
Get the fast time on all levels in Chapter 5 - Chain
Get the fast time on all levels
Obtain 10 unique collectibles
Obtain 20 unique collectibles
Obtain all collectibles
Collect the Frog
Collect the Sword
Get the Gun
View the Credits
?????