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