Here is the full list of all 21 September 28 Pizza achievements.
Complete Quest 0 without being late
Kill 20 zombies
Kill 50 zombies
Kill 100 zombies
Kill 500 zombies
Kill 1000 zombies
Complete Quest 1 without being late
Complete Quest 2 without being late
Complete Quest 3 without being late
Complete Quest 4 without being late
Complete Quest 5 without being late
Complete Quest 6 without being late
Complete Quest 7 without being late
Complete Quest 8 without being late
Complete Quest 9 without being late
Finish the game without dying
Eat a hot dog
Eat 10 hot dogs
Eat 30 hot dogs
Hit a critical shot
Hit 10 critical shots