Here is the full list of all 51 NEO: The World Ends with You achievements.
Collected all graffiti.
Collected all Secret Reports.
Collected all pins.
Equipped a 6-pin set.
Purchased every type of fashion item.
Mastered 300 types of pins.
Collected all social network rewards.
Erased all Pig Noise.
Earned all Scramble Slam rewards.
Completed all Remind images.
Collected 80% of all enemy dossiers.
Earned gold medals in 15 Dive missions.
Ordered one of every food item.
Completed the Final Time Trial.
Collected all CDs.
Took down every type of enemy.
Completed Another Day.
Connected your entire social network.
Completed the Final Day of Week 3.
Reached Level 100.
Wore a party's worth of full outfits.
Became a regular at every restaurant.
Reached VIP Level 5 with every brand.
Mastered 200 types of pins.
Visited all areas of Shibuya.
Won a 20-reduction chain battle.
Completed the Final Day of Week 2.
Took down 6,000 enemies.
Erased a group of Noise using a Killer Remix.
Reached VIP Level 5 with 8 brands.
Mastered 100 types of pins.
Possessed ￥999,999.
Became a regular at 8 restaurants.
Landed enough Beatdrop Combos to boost your Groove above 200%.
Wore a full outfit of clothing whose abilities all require over 100 Style.
Took down 3,000 enemies.
Reached VIP Level 5 with a brand.
Won an 8-reduction chain battle.
Became a restaurant regular.
Completed the Final Day of Week 1.
Mastered 50 types of pins.
Took down 1,500 enemies.
Unlocked all of a full outfit's abilities.
Wore a full outfit using a single brand.
Mastered 30 types of pins.
Wore a full outfit.
Exceeded 100% Fullness.
Mastered 10 types of pins.
Evolved a pin.
Mastered one type of pin.
Won your first battle.