Here is the full list of all 43 Knack 2 trophies - there are 27 bronze, 12 silver, 3 gold and 1 platinum.
Learned all super moves.
Cleared all chapters on the Normal difficulty level or higher.
Cleared all chapters on the Hard difficulty level or higher.
Unlocked your first Crystal Knack.
Acquired all gadgets.
Defeated 300 enemies using kicks.
Learned all basic power-up skills.
Cleared a Coliseum Attack stage.
Cleared a Time Attack stage.
Cleared one chapter on the Very Hard difficulty level.
Acquired your first Knack medal.
Cleared all chapters on the Easy difficulty level or higher.
Defeated the last boss.
Defeated all Titans.
Defeated 700 robot enemies.
Defeated 50 immobilized enemies.
Learned the Ultimate Move from Ava.
Broke the blocks of 50 enemies.
Stunned enemies 50 times with sunstone bombs.
Defeated the relic monster that Xander created.
Defeated Gundahar.
Learned the Boomerang from Ava.
Defeated 10 enemies as small Knack.
Defeated Rothari.
Defeated 500 goblin enemies.
Ran 26.2 miles.
Found 10 treasure chests.
Found 30 chests containing relic energy.
Learned the Hook Shot from Ava.
Acquired your first crystal relic.
Completed your first gadget.
Defeated 300 enemies using punches.
Learned the Heavy Punch from Ava.
Performed your first Knack upgrade.
Acquired your first gadget part.
Acquired all trophies.
Defeated 100 enemies using Jump Kicks.
Defeated 50 enemies using parries.
Equipped a combo meter and landed a 100-hit combo.
Acquired 50 Knack medals.
Acquired 70 Knack medals.
Achieved 5 stars in every Time Attack.
Achieved 5 stars in every Coliseum Attack.