Here is the full list of all 30 Hookbots trophies - there are 15 bronze, 8 silver, 6 gold and 1 platinum.
Collect all Hookbots trophies
Complete all solo play challenges
Unlock Robot Castle
Beat solo play campaign in hard mode
Destroy 3 bots simultaneously with a special ability
Destroy 3 bots with one hook shot
Win or lose a Hookball game 7-1
Unlock all party game modes
Score 4 points with stolen eggs
Hold the flag for 30 seconds
Win a match with the instakill hook mutator without being destroyed
Complete all mid solo play challenges
Beat solo play campaign in any difficulty
Complete the tutorial
Play your first 5 matches
Complete a party session
Destroy 2 bots simultaneously with a red sword
Finish a Party Coin Collector game with 50 or more coins
Complete all easy solo play challenges
Unlock Volleyhooks Beach
Unlock all taunts
Unlock all bots
Survive the doggobots hard challenge with 1 health left
Unlock big boss mode
Destroy 10 bots without being destroyed
Unlock Baskethook court
Unlock Forest Plains
Grab 3 enemy robot parts with the Robo-thieves mutator
Destroy 2 bots with one hook shot
Destroy 1000 bots