Knack 2 has a total of 43 Trophies (1 Platinum, 3 Gold, 12 Silver, 27 Bronze for a total of 1215 points). Below you can find the full Knack 2 trophy list:
Knack 2 Trophies
Knack: The Ultimate Invention 
Acquired all trophies.
Rothari Badge 
Defeated Rothari.
Gundahar Badge
Defeated Gundahar.
Xander Badge
Defeated the relic monster that Xander created.
Titanic Triumph 
Defated all Titans.
Artifact Boss Badge
Defeated the last boss.
Heavy Punch Certificate
Learned the Heavy Punch from Ava.
Hook Shot Certificate
Learned the Hook Shot from Ava.
Boomerang Certificate
Learned the Boomerang from Ava.
Big Hitter
Defeated 300 enemies using punches.
King of Kicking
Defeated 300 enemies using kicks.
Ultimate Move Certificate
Learned the Ultimate Move from Ava.
Tricky Customer
Defeated 50 immobilized enemies.
Jumping Knack Flash
Defeated 100 enemies using Jump Kicks.
Marathon Runner
Ran 26.2 miles.
Treasure Hunter
Found 30 chests containing relic energy.
Blockbuster
Broke the blocks of 50 enemies.
Pro Parrier
Defeated 50 enemies using parries.
Goblin Gobbler
Defeated 500 goblin enemies.
Robot Wrecker
Defeated 700 robot enemies.
Nose for Treasure
Found 10 treasure chests.
The Doctor’s Apprentice
Completed your first gadget.
Crystal Relic Collector
Acquired your first crystal relic.
All-New Powers
Unlocked your first crystal Knack.
Gadget Boy
Acquired your first gadget part.
The Challenges Begin
Acquired your first Knack Medal
Onwards and Upwards
Performed your first Knack upgrade.
Combo King
Equipped a combo meter and landed a 100-hit combo.
Sunstone Stunner
Stunned enemies 50 times with sunstone bombs.
Relic Racer
Cleared a Time Attack stage.
Gladiator
Cleared a Coliseum Attack stage.
Smaller is Better
Defeated 10 enemies as small Knack.
Novice Hero Knack
Cleared all chapters on the Easy difficulty level or higher.
Hero Knack 
Cleared all chapters on the Normal difficulty level or higher.
It’s a Knackout
Cleared all chapters on the Hard difficulty level or higher.
Halfway There
Acquired 50 Knack medals.
The Doctor’s Disciple
Acquired all gadgets.
Super Move Master
Learned all super moves.
Incredible Power!
Learned all basic power-up skills.
Sucker for Punishment
Cleared one chapter on the Very Hard difficulty level.
You’ve Got the Knack
Acquired 70 Knack medals.
Speed Demon
Achieved 5 stars in every Time Attack.
King of the Coliseum
Achieved 5 stars in every Coliseum attack.
There are a lot of kill-related trophies, as well as medals and time trials. Luckily, we do not have to complete the game on the highest difficulty (only on hard).
What are your thoughts on the Knack 2 Trophy List? How long do you think the platinum is going to take? Leave your thoughts in the comments below and check out the full Knack 2 Trophy Guide & Roadmap for more info!
Looks like a pretty standard and boring list to me.