Here is the full list of all 12 Inch by Inch achievements.
Win the game on "Intern" difficulty.
Win the game on "Scientist" difficulty.
Win the game on "Professor" difficulty.
Complete the tutorial.
Win a game on Scientist difficulty or above, with only 5% of time left.
Win a game on Scientist difficulty or above, using the Reverter twice.
Win a game on "Scientist" difficulty without running.
Get trapped inside a boot.
Climb into the fridge.
Never touch the floor, when your size is 3 feet (91cm) or less, on "Professor" difficulty.
Start at the floor and reach any of the tabletops, when 8 inches (20cm) or smaller.
Win a game without picking up any objects except ingredients, on Scientist difficulty or above.