Here is the full list of all 24 TwinCop achievements.
Complete chapter three.
Set 250 enemies ablaze with Josie's Flare Gun ability.
Send 75 enemies away with Brody's Holy Mackerel ability.
Use Twinsanity 100 times!
Punch 250 enemies with Dr. Fist's Spectral Fist ability.
Destroy all of the PopTop vending machines.
Tase 250 enemies with Will's Super Taser ability.
Complete chapter two.
TWINCOP_ACH_WATERFALL
Complete the training.
Defeat Mecha Pontoon.
Defeat PopTank.
Drive TwinCar to its destination without hitting any other cars.
Kill 10 enemies in the grocery store with fruits and vegetables.
Leave the grocery store armed with fruits or veggies.
Cut the correct bomb wire 3 times with less than 5 seconds remaining on the timer.
Complete chapter one.
Fill the TwinCar with gas without spilling any.
Drive TwinCar to its destination while only driving in reverse.
Find all of the friendship bracelets.
Attract 250 enemies with May's Donut Trap ability.
Snipe 150 enemies with Angela's Laser Snipe ability.
Block 500 projectiles with John's Baton Block ability.
Grapple 75 enemies with Killa Kill's Hookshot ability.