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