Here is the full list of all 22 SkyScrappers achievements.
Complete all the single player campaigns
Complete the single player campaign as Kichirou
Do a slide trick
Complete the single player campaign as Jessica
Complete the single player campaign as Solene
Complete the single player campaign as Phileas
Strike a flaming object into another character
Do a special move jump
Do a long jump trick
Finish a game with a weapon attack
Win a game by landing on the roof of a building
Complete a four-player multiplayer game with all human players
Win a match for the first time
Win a game without losing any health
Hit an opponent with a ground pround attack
Strike a falling object into another character
Do a special move attack
Win your first round
Completely fill your super bar
Do a three point landing trick
Do a vertical rush trick
Do a jump of over 15m from an inclined platform