Here is the full list of all 19 Tokyo 42 achievements.
Reach highest level in copdrop
Complete all missions and get all collectables
Collect all the weapons
Complete all ninja missions
Complete all roninja missions
Complete all ronin missions
Complete the bike race
Collect all cash drops
Collect all cat skins
Collect all coats
Unlock all secret portals
Find all Tokyo Tourism sights
Complete the story
Complete Act 2
Complete Act 1
Get a grenade through the hoop
Kill three enemies with one grenade
Kill yourself with a grenade
Complete Intro