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