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