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