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