Here is the full list of all 30 B67 achievements.
1000 bullets fired
Reach the ground floor
500 bullets fired
100 enemies killed
$1000 earned
Use 9 different guns
50 enemies killed
Use 6 different guns
100 bullets fired
25 enemies killed
Die once
Use 3 different guns
Spot 50 footprints
Die 10 times
Die 50 times
Die 100 times
5000 bullets fired
250 enemies killed
$2500 earned
$5000 earned
$10000 earned
$1000 spent
$2500 spent
$5000 spent
$10000 spent
Use all guns
Shot from behind 20 times
Walk 10000 steps
Take longer than 5 mintues to complete a level
Play for 2 hours