Here is the full list of all 12 Yorbie: Episode One trophies - there are 8 bronze, 3 silver and 1 gold.
Complete all Insane Survivor levels in single player mode
Collect all 6 types of weapons in the game
Collect the Rare Transistor hidden in one of the levels
Fall off 20 times in any level
Kill 3 bots or more with a single pipe bomb
Complete any level using only the Plasma Pistol
Complete the first level in single player mode
Break the upgrades on any of your weapons
Stack a weapon with 3 of the same upgrades
Collect 5000 Cogs and 1000 Energy
Complete any Insane Survivor level without losing any lives in single player mode
Complete all Insane Survivor levels without any reboots in single player mode