For the executions that require you to press R1, your enemy must be low enough on health for it to work. Only performing the execution styles on mobsters will count toward the execution achievements.

Back Of The Head execution: Use a pistol and stand in front of your enemy. While they are standing, lock onto them and press R1.

Barehanded Kneeling execution: Get your enemy on their knees by shooting them in the knee or beating them down. Then, without any weapons drawn, stand in front of your enemy. While they are still kneeling, lock onto them and press R1.

Barehanded Standing execution: Without any weapons drawn, stand in front of your enemy. While they are standing, lock onto them and press R1.

Between The Eyes execution: Use a revolver and stand in front of your enemy. While they are standing, lock onto them and press R1.

Blackhand execution: Kill your enemy with your fists without grabbing them.

Blackhand Grapple execution: Kill your enemy with your fists while grabbing them.

Bombs Away execution: Kill your enemy with dynamite, a bomb, an explosive barrel, or an explosive crate.

Bottle execution: Kill your enemy by throwing a bottle at them.

Chin Up execution: Use a 2x4 and stand in front of your enemy. While they are standing, lock onto them and press R1. 2x4s can be found by blowing up a burning barrel on the street.

Clavicle Crush execution: Use a tire iron and stand in front of your enemy. While they are standing, lock onto them and press R1.

Cocktail Hour execution: Kill your enemy with a Molotov.

Crooked Cop execution: Use a police baton and stand in front of your enemy. While they are standing, lock onto them and press R1.

Disarmed execution: Shoot your enemy in the shoulder to make them drop their weapon.

Double Play execution: Get your enemy on their knees by shooting them in the knee or beating them down. Then, use a baseball bat and stand in front of your enemy. While they are still kneeling, lock onto them and press R1.

Face-off execution: Get your enemy on their knees by shooting them in the knee or beating them down. Get directly in front of them while holding a shotgun. Lock on to them and press R1.

Foot In Mouth execution: Get your enemy on their knees by shooting them in the knee or beating them down. Get directly in front of them while holding a magnum. Lock on to them, then press R1.

Gut Shot execution: Use a shotgun and stand in front of your enemy. While they are standing, lock onto them and press R1.

Hard Head execution: Kill your enemy by slamming their head into a counter or other low object.

Hats Off execution: Get your enemy on their knees by shooting them in the knee or beating them down. Get directly in front of them while holding a pistol. Lock on to them and press R1.

Headstrong execution: Use a Tommy gun and stand in front of your enemy. While they are standing, lock onto them and press R1.

How's Your Leg execution: Get your enemy on their knees by shooting them in the knee or beating them down. Get directly in front of them while holding a golf club or shovel. Lock on to them, and press R1.

Kneecapped execution: Shoot your enemy in the knee.

Last Gasp execution: Strangle your enemy to death with your bare hands.

Look at Me execution: Get your enemy on their knees by shooting them in the knee or beating them down. Then, use a revolver and stand in front of your enemy. While they are still kneeling, lock onto them and press R1.

Magnum execution: Kill your enemy with a magnum.

Melee Weapon execution: Kill your enemy using any melee weapon.

Neck Boned execution: Get your enemy on their knees by shooting them in the knee or beating them down. Get directly in front of them while holding a tire iron. Lock on to them and press R1.

Neck Kink execution: Get your enemy on their knees by shooting them in the knee or beating them down. Then, use a police baton and stand in front of your enemy. While they are still kneeling, lock onto them and press R1.

Over Cooked execution: Throw your enemy into a furnace. Furnaces can be found in bakeries and funeral homes.

Pipe Down execution: Use a lead pipe and stand in front of your enemy. While they are standing, lock onto them and press R1.

Pistol execution: Kill your enemy with a pistol.

Protect Ya Neck execution: Use a golf club or shovel and stand in front of your enemy. While they are standing, lock onto them and press R1.

Revolver execution: Kill your enemy with a revolver.

Riddled With Lead execution: Get your enemy on their knees by shooting them in the knee or beating them down. Get directly in front of them while holding a Tommy gun, lock on to them, and press R1.

Road Rage execution: Kill your enemy by running them over with a car.

Shotgun execution: Kill your enemy with a shotgun.

Sicilian Candle execution: Get your enemy on their knees by shooting them in the knee or beating them down. Get directly in front of them while holding a 2x4, lock on to them, and press R1. 2x4s can be found by blowing up a burning barrel on the street.

Silent Assassin execution: Strangle your enemy to death using the garrote wire.

Stained Glass execution: Kill your enemy by throwing them through a window.

Sure Shot execution: Kill your enemy with a head shot.

Taste My Chamber execution: Use a magnum and stand in front of your enemy. While they are standing, lock onto them and press R1.

Tommy Gun execution: Kill your enemy with a Tommy gun.

Traffic Accident execution: Kill your enemy by throwing them in front of a moving vehicle. Do not stand in front of traffic or it will stop; stand to the side of the road.

Wallpapered execution: Kill your enemy by slamming them against a wall.

Watch Your Step execution: Kill your enemy by throwing them off a roof, ledge, two-story window, etc.

Wrenched execution: Get your enemy on their knees by shooting them in the knee or beating them down. Get directly in front of them while holding a lead pipe, lock on to them, and press R1.

You're Out execution: Use a baseball bat and stand in front of your enemy. While they are standing, lock onto them and press R1. Note: There is a glitch with the onscreen message, which will call it a "Melee Standing Execution".