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