Here is the full list of all 28 Ninja Pizza Girl achievements.
Make an outfit
Use the difficulty options
Buy a video game
Safely fall 10 metres
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 all the outfits
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