Here is the full list of all 33 Colossus Down trophies - there are 18 bronze, 8 silver, 6 gold and 1 platinum.
You ended Angelica's dictatorship.
MechaNika's core has reached level 3.
You destroyed 499 things.
You reprogrammed GLaDYS.
You broke the motorbike that belongs to Kanedaaaaaaa!!!
MechaNika's core has reached level 2.
You made one of Donald Tank's missiles fall on an enemy.
MechaNika's core has reached level 1.
You scattered your neighbours ashes.
You levelled the school.
You got all the trophies!
You didn't kill anyone at school.
You scared away all the pigeons.
You introduced the three passwords for access 632 without any errors.
You didn't get run down by a train on the Obsoloop underground.
You ascended the Obsotech tower without crashing into anything.
You accepted GLaDYS' bribe.
You didn't smash the piñata.
You found the golden ticket.
You left the Labyrinth of Sorrow withouth getting lost.
You crushed Kato's revolution.
You interrupted the transmission.
You found the message in a bottle.
You overcame the digital walkway without falling into the void.
You killed Gem.
You let Gem live.
You got all the questions from Ellie's test right.
You completed the Plan for the Destruction of All Things That Aren't Cool.
You left the world in Agatha's hands.
You went back in time to be with Ellie.
You destroyed absolutely everything.
You completed the mission with a broken matter recovery machine.
MechaNika's core has reached its maximum level.