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