All 4 One trophies

There are 45 trophies in Ratchet & Clank: All 4 One. 36 trophies are revealed to the player (27 bronze, 6 silver, 3 gold), while 9 trophies are hidden, and the player must discover them. The platinum trophy is among the hidden trophies.

Like the Ratchet & Clank Future: A Crack in Time trophy list, completing the game at 100% isn't required to get the platinum trophy. You don't need to complete every level in co-op, or completing the levels on hard difficulty, or obtaining any skill point.

Also, if we exclude the platinum which is given for obtaining every trophy, there's 44 trophies in the game, which is an obvious reference to the title, and the 4-player co-operative gameplay.

Gold

 * For the Zombie Apocalypse - Buy all the weapons.
 * The First Million is Always the Hardest - Have 1,000,000 bolts banked.
 * Upgraded - Fully upgrade all weapons.

Silver

 * Bomb Disposal - Blow up 85% of the exploding crates in Aldaros Plains.
 * On Some Planets They're a Delicacy - Shoot all of the slorgs back into the waters of Octonok Cay.
 * Upping your Arsenal - Buy half of the weapons.
 * Tricked Out - Fully upgrade one weapon.
 * Galactic Hero - Kill 500 enemies.
 * The Bolt Banker - Have 100,000 bolts banked.

Bronze

 * Keep the Meter Running - Don't let the air taxi take damage in Luminopolis.
 * El Matador - No one gets hit by a grove beetle in the Deadgrove.
 * It Was Like That When We Got Here - Destroy all of the towers in Gorthon Crater.
 * A Moment of Reflection - Use only Reflectors to destroy the generators in Phonica Moon's security tunnels.
 * Mission Improbable - Get through the laser walls at the end of Uzo City in 45 seconds.
 * Night Lights are for Wimps - Get through Rossa Fields without using any of the energy repositories.
 * The Mad Plasmabomber - Kill eight enemies with one shot.
 * Pyromancer - Barbecue four enemies at the same time using the Pyro Blaster.
 * Knockout Artist - Kill three enemies with one attack using the Blitzer.
 * Fine, But You're Cleaning Up After Them - Get 10 critters on screen at once.
 * Eight Seconds - Kill eight enemies in eight seconds using the Darkstar Fission Tether with two or more teammates.
 * Zurkon the Legend - Kill 100 enemies with Mr. Zurkon out.
 * Melee Legend - Kill 150 enemies with melee.
 * Q-Force Legend - Kill 50 enemies in a row using melee without taking damage.
 * Doppelbanger Legend - Destroy 30 enemies while they're distracted by the Doppelbanger.
 * Quantum Deflector Legend - Absorb 500 shots with the Quantum Deflector.
 * Zoni Legend - Kill 15 enemies that have been slowed down by the Zoni Blaster.
 * Cloaker Legend - Kill 15 enemies while using the Cloaker.
 * Quick Killer - Kill eight enemies in two seconds.
 * Overload Legend - Use the Co-op overload to kill 60 enemies.
 * Life Support - Revive a teammate with one second left on their timer. (2P +)
 * Friendship through Firepower - Buy your first weapon.
 * Vac-U Legend - Kill 50 enemies with the Vac-U 4000.
 * Waiting Room - Reach the lobby. (2P +)
 * Connected - Play an online game. (2P +)
 * Old-School - Play a single-player game.
 * Couch Potato - Play an offline-only game. (2P +)

There's also 9 hidden trophies.

Platinum

 * 4 Play - Collect all of the Trophies in the game.

Gold

 * The Saviors of Magnus - Defeat the Loki Master.

Bronze

 * Intergalactic Tool of Justice - Defeat the Z'Grute.
 * Anyone for Sushi? - Defeat the octomoth.
 * Now We Need a Really Big Tissue - Defeat the Wigwump.
 * Spog 2.0 - Defeat Commander Spog.
 * Now That's a Big Fish - Defeat King Sepiad.
 * Space Cadet - Complete Terawatt Forest.
 * Winter Wonderland - Escape the Polar Sea.