Dan Johnson Memorial:
During the very last mission, look next to the door to the Hall of Villains to find an entrance to the ventilation system. Find a detached grate leaning against the wall. The opening seems to lead abruptly to a dead end, but you can head inside and turn to the right to enter a room with a statue of a man wearing a Captain Qwark t-shirt. This man is the late Dan Johnson, a former member of the Insomniac team. Stand on the platform in front of the statue and hold the Tourbot to hear a recorded memorial message that pays homage to Dan. References to him have appeared in previous titles within the series as well.
A Walk in the Park - Beat the game on Cadet difficulty.
Thug Life - Win the Destructapalooza Bronze Cup.
Precious Metal - Collect 200 raritanium over the course of the game.
Exterminator - Beat Pest Control with just the Omniwrench.
Leap for Your Life - Grav-Leap to the Thug ship circling the Nebulox Seven.
Sweet Justice - Defeat Neftin Prog.
Shaky Truce - Form an alliance with Neftin Prog.
Cross the Streams - Defeat the Nether Leader and banish his kind.
The Adventurer - Beat the game on Hero difficulty.
Thug Rookie - Win the Destructapalooza Silver Cup.
Armored and Dangerous - Purchase all armor.
Going Commando - Upgrade 1 weapon to level 6.
Greed - Collect 1,000,000 bolts over the course of the game.
Your Worst Nightmare - Scare at least one of every type of enemy using the Nightmare Box.
Into the Nether Region - Complete all Netherverse segments.
The Legend - Beat the game on Legend difficulty.
The Show Off - Beat the game in Challenge Mode.
Thug Champion - Win the Destructapalooza Gold Cup.
Vault Cracker - Unlock the vault on planet Thram.
In Case of Zombies... - Purchase all weapons.
Up Your Arsenal - Upgrade all weapons to level 6.
Gold Rush - Collect all Gold Bolts.
The Pride of Fastoon - Earn all Bronze, Silver, and Gold trophies.