Here is the full list of all 21 Giana Sisters: Dream Runners achievements.
Dash through a breakable block.
Hit an opponent with a twist-upgraded cannonball.
Hit an opponent with an owl.
Swap places with another player.
Hit all three opponents with the same power dash.
Hit an opponent with a meteor.
Hit an opponent with 5 supertwirl projectiles during one supertwirl.
Ghost through a projectile or hazard after using the Owlverpower.
Dash 3 owls in succession in a bot match (single-player only).
Jump on the heads of 3 owls in succession in a bot match (single-player only!)
Twirl on top of a jump.
Score a point while using boost.
Win on Gentle Promenade against three bots or in an online match.
Win on Nettle Vale against three bots or in an online match.
Win on Embersnow Mountain against three bots or in an online match.
Win on Stranglevine Ruins against three bots or in an online match. This unlocks the Dieselstörmer.
Win on Soarstone Crag against three bots or in an online match. This unlocks F5 the robot.
Win on Quaking Mire against three bots or in an online match.
Win on Chasm of Tears against three bots or in an online match. This unlocks the Voodoowl.
Win on Doomtide Forest against three bots or in an online match.
Win on Reaving Falls against three bots or in an online match. This unlocks the ninja.