Here is the full list of all 38 Toki Tori achievements. It takes around 10-12 hours to unlock all of the achievements on Windows.
Complete all Creepy Castle normal levels
Telewarp directly into lava
Stand on an ice block for 12 seconds
Collect 200 eggs
Press "Try Again" 10 times on one level
Play Toki Tori for 60 minutes without being idle for more than 2 minutes
Finish a level without using all items
Fall into the lava
Collect 100 eggs
Make Toki Tori dizzy
Complete all Forest Falls normal levels
Make Toki Tori look sad
Use 42 InstantRocks™ to finish a level
Use 32 bridges to finish a level
Freeze 50 monsters
Collect 500 eggs
Collect 1000 eggs
Finish all hard levels
Trap 30 ghosts
Get really close to a monster
Suck up 30 slugs
Trap Toki Tori between two Switchbricks
Complete all normal levels without using the Wildcard
Watch the ending
Complete all Forest Falls hard levels
Complete all Creepy Castle hard levels
Complete all Slimy Sewer normal levels
Complete all Slimy Sewer hard levels
Complete all Bubble Barrage normal levels
Complete all Bubble Barrage hard levels
Find the Tunnel of Love
Finish Forest Falls, Bonus 3
Find her.
Complete all Test Lab normal levels
Stand in the beam in Test Lab bonus level 2
Stand in the beam in Test Lab bonus level 6
Stand in all sun beams
Collect all ten snowflakes that appear in December before they melt