Here is the full list of all 28 Ninja Pizza Girl achievements.
Deliver all pizzas in a time that's Beyond Classification
100% game completion
Fall out of the map
Fail and retry a level 10 times
Deliver 100 pizzas
Make all the outfits
Complete the Ninja Pizza Girl story
Complete "Loser Town"
Complete "R-E-S-P-E-C-T"
Deliver a pizza in a R-E-S-P-E-C-T level without attacking a single rival ninja
Complete "Poverty Bites"
Start a delivery with the lowest possible self-esteem and successfully deliver the pizza
Deliver a pizza in a time that's Beyond Classification
Deliver a pizza in an A+ time
Successfully attack 100 ninjas
Buy ALL the video games
Complete "For Love of Pizza"
Safely fall 40 metres
Complete "Fear of Falling"
Complete “No Pants No Pizza”
Buy a video game
Deliver a pizza in First Person Mode
Have a cup of tea, some chocolate or a nice hot bath
Make an outfit
Be "in the zone" for 30 continuous seconds
Safely fall 10 metres
Use the difficulty options
Deliver 1,000 pizzas