Most of these will come natural through the progression of the campaign and/ or Echo; a few might prove difficult and I've tried to add an ** with a quick explanation how. The Secret ones are progressive story related so if you don't want to SPOIL anything for yourself don't scroll that far ahead.
This can be done on multiple playthroughs and modes (campaign/campaign replay/echo) Thxz for @Drummin003 for asking.
As long as the name is uncovered/displayed of the skillshot, it's registered, it doesn't need to be checked off to count towards the achievement. Thxz @Moe Marston for asking.
Have fun and "Kill with Skill"
General I
Graffiti - Kill an enemy by kicking him against a surface.
Shocker - Kill an enemy by flinging him into an electrical source.
Pricked - Kill an enemy by flinging them into a cactus.
Voodoo Doll - Kill an enemy by flinging them into a sharp object.
Vertigo - Send an enemy down a huge drop.
Fly Guy - Kill an enemy by flinging them into a swarm of electro flies. ** Act 3 Ch 2, the first swarm you come across; Run across the bridge and upstairs where there's a few creeps, the Fly swarm will be just outside the building and fairly easy to earn the skill shot by kicking one of the creeps into the swarm.
Afterburner - Kill an enemy who is on fire.
EnviroMental - Kill on or more enemies using an enviromental explosive.
Feeder - Feed an enemy to a flytrap
Bad Digestion - Cause a Flytrap to swallow something explosive. **Can be a bouncer or elemental explosive.
Antidote - Kill an enemy who is infected by the puffball gas.
Toxic Love - Kill an enemy while infected by puffball gas.
Nominated - Kill an enemy with a Nom parasite on their head.
ScareCrow - Put a Nom parasite on an enemys head then impale them.**Voodoo Doll/Spiked(@annndtpain) them after Nom is on
Leak - Put a Nom parasite on an enemys head then headshot them.
Heads Up - Put a Nom Parasite on an enemy's head then take their head off. **Use a charged Flail gun shot to take their head off. I pulled it off in Act 5 Ch 3.
FastFood - Ram an enemy to death with a hot dog cart.
Sausage Fest - Kill an enemy using a hot dog cart explosion.
Exterminator - Kill an entire swarm of electro flies.
Killer news - Kill someone with the explosion of a newsbot
Intoxicated - Kill an enemy while drunk on Nom Juice.
General II
Slam Dunk - Smash an airborne enemy into the ground using the Thumper.
Trap Shooting - Use bullets to kill a Thumped enemy.
Fly Swatter - Thump an enemy so he smashes into the ceiling or an impaler.
Fertilizer - Explode two or more thumped enemies using an enviromental explosive.
Touchdown - Thump a stunned miniboss to his death.
Bossed - Kill a miniboss.
Fire in The Hole - When a miniboss is stunned, kick him from behind, then shoot him in the butt.
Kick off - Remove a miniboss's helmet, then when he is stunned again, kick his head off.
Whiplash - Remove a miniboss's helmet, then when he is stunned again, leash his head off.
Stomach Pump - Kill a miniboss by firing a charged drill into his stomach and then kicking it.
Friendly Fire - Kill an enemy by flinging them into the fire of another enemy.
Bombshell - Kill two or more enemies from an exploding Flailbomber.
AssPlosion - Kill a burnout by shooting his ass growth.
Blind Fire - Kill Someone while blinded by a flare
Discharged - Kill a Heavy Echo trooper with a charged PMC when he's charging his.
SkyJack - Kill a gyrocopter pilot while the vehicle is airborne.** Act 5 Ch 1, while Trishka first is working on the monorail run to the guardrail and two Gyrocopters spawn head-on, in a straight path in the distance. Use your Head Hunter and put a round into a pilot to take them down.
Parashoot - Leash an enemy out of a gyrocopter and kill him before he lands.
Flak - Destroy a gyrocopter using a indirect explosion.
Gotcha ! - Leash a Creep or Skull Flaregunner and kill them in mid air.
Full Throttle - Use bullets to kill two or more enemies without letting go of the trigger.
First in Last out - Get an enemy airborne, kill a different enemy, then kill the first before he lands.
PeaceMaker Carbine.
Headshot - Kill an enemy with a headshot
Bullet Kick - Kick an enemy and shoot him to death mid-air.
Bullet Slide - Slide into an enemy and shoot him to death mid air.
Gag Reflex - Kill an enemy with a shot to the throat.
Rear Entry - Kill an enemy by shooting him in the ass.
Trip wire - Shoot a running enemy in the legs to trip him, then finish him off before he gets up.
Mercy - Shoot an enemy in the balls and kick or shoot his head off.
Boned - CHARGED: Kill an enemy within a moment of getting them in your sights.
Overkill - CHARGED: Execute a headshot with the Charge Shot.
X-Ray - CHARGED: Kill two or more enemies with a single Charge Shot.
Screamer.
One Hit Wonder - Peform a clean execution by using only a single bullet to kill the enemy.
Surgeon - Kill an enemy by shooting only one single limb repeatedly.
Fast Draw - Kill an enemy the moment you have them in your sights.
SnapShot - Kill an airborne enemy the moment you have them in your sights.
GunSlinger - Score two or more FAST DRAWs or SNAPSHOTs in a row.** Doesn't have to be IMMEADIATE, my kills were a few seconds apart.
Enlightenment - CHARGED: Shoot an enemy in the head with a flare and let it explode.
Misfire - CHARGED: Flare an enemy but kill him before it explodes.
Fireball - CHARGED: Shoot an enemy with a flare so it explodes and kills another enemy.
FireWorks - CHARGED: Explode an enemy who is 20 meters or higher in the air.
FireFighter - CHARGED: Ignite three or more enemies and kill them while they burn.
FlailGun.
Grenade Gag - Wrap a flail around the head of an enemy and explode it.
Gang Bang - Kill two or more enemies with a single flail explosion.
MineField - Kill an enemy by exploding a flail attached to a surface.
Sadist - Wrap a flail around an enemy but kil him before it explodes.
Meat Slicer - Slice an enemy in half while wrapping the flail around an object.** Easy when a enemy is near a pillar or building column, aim for the torso.
Head Slicer - Decapitate an enemy after wrapping the flail around an object.** Easy when a enemy is near a pillar or building column, aim for the head
Homie Missile - Use a flail-wrapped airborne enemy to kill another enemy.
Smart Mine - Use a flail-wrapped standing enemy to kill an airborne enemy.
Chain Reaction - CHARGED: Slice two or more enemies in half using a flail Charge Shot.
French Revolution - CHARGED: Decapitate two or more enemies with a flail Charge Shot.
BoneDuster.
Topless- Blast away the top half of an enemy.
Legless - Blow the legs off an enemy.
SplatterPunk - Kill a downed enemy by blasting him against the floor.
Pump Action - Get an enemy airborne then shotgun blast him into an enviromental hazard.
Torpedo - Kill an enemy by shooting him while sliding.
PileDriver - Get an enemy airborne then smash him into a surface with the shotgun blast.
Juggler - Blast an airborne enemy twice then kill him before or on landing.
Slugfest - Kill two or more enemies with one standard shot.
Burn - CHARGED: Vaporize two or more enemies with a single Charge Shot
Acid Rain - CHARGED: Vaporize two or more enemies in mid-air.
Head Hunter.
Show Off - Kill an enemy from 10 metres without using the scope.
Broken Wings - Kill a thumped enemy with a guided bullet.
Accident - Shoot an enemy and have him die from hitting an enviromental hazard.
Bluff - Kill an enemy who is not actually the chosen target of the bullet.
Nut Cracker - Kill an enemy by guiding a bullet into his balls. ** Found it easy to do to a guy on a stationary mini-gun because they don't dodge your shots.
HotShot - Kill a dodging enemy by targeting a weak spot like the head or throat.
Premature - CHARGED: Explode the bullet to kill the target before it hits him.
Letter Bomb - CHARGED: Explode two or more enemies using a single bullet.
Shrapnel- CHARGED: Explode two or more airborne enemies using a single bullet. **Thump a group, focus your charged shot on two of more close together and then detonate.
Early Retirement - CHARGED: Kill an enemy controlled with the charged bullet before it explodes ** Hit him with a charged shot and then move his body with the sticks towards Voodoo spikes.
Bouncer.
Direct Hit - Kill an enemy with a direct hit from the cannonball.
Money Shot - Kill an enemy by launching a ball at them and exploding it before it hits anything.
Boom - Kill two or more enemies with one cannonball
Carpet Bombing - Bounce a cannonball at least two times before killing an enemy with it
Bully - Detonate a cannonball to kill an enemy just after knocking them over with it.
Trick Shot - Kill an enemy with a cannonball bounced off a wall or obstacle
Lucky Shot - Kill an enemy with a cannonball that travelled over 100 metres without bouncing.** Act 4 Ch 2 after you exit the building there's a set of stairs leading down with a hotdog cart on top, hang out on the top of these stairs and lob a few shots down and the skill shot shold pop for ya.
Meat Fountain - Kill two or more airborne enemies with one cannonball
Kick of Doom - CHARGED: Kill an enemy by kicking a cannonball.
Sledgehammer - CHARGED: Kill three or more enemies with one charged cannonball.
Penetrator
Breakdance - Drill an enemy into the ground
Fan-Tastic - Drill an enemy into the ceiling
Root Canal - Inset a drill into an enemy's head
Twisted - Fire a drill into an enemy but have him die by other means
Mile High Club - Send an enemy into the sky
Air Strike - Impale a thumped enemy into a standing enemy *** Thxz @Salvatore 2 for the idea tactic. Just after the Drop pod in Act 7 Ch 1 you come down a flight of steps with a Creep running at you, a Bouncer Mini-Boss take's him out and two Bone Duster thugs come at you. Thump everyone and then hit one of the airborne thugs with a CHARGED Penetrator shot, continue holding LT to ADS , line up the dazed Mini-Boss on the ground and press RT to direct the thug and the Penetrator round at the Mini-Boss, skill shot earned.
Shishkebab - Impale two or more enemies with a single drill
Wingmen - Impale two or more airbone enemies with a single drill** Thump the ground and rotate around the group of enemies until you get two of them line-up, then let `er rip. **or as Crimson Drifter has pointed out, after thumping the group hit one airborne target with a charged shot and guide him into another.
Stringer - CHARGED: Suspend a drilled enemy mid-air, then kick him into another enemy.**Easy tatic I used (although this can be one of the more frustratin) is line up a normal thug in front of a slow moving min-boss, hit him with the charged shot and then kick him into the min-boss.
Drilldo - CHARGED: Ram two or more enemies during a slide with the charged weapon.
Secret. (May contain Spoilers)
Pancake -
Mass Extinction -
Kill-O-Watt. -
*** Spoiler - click to reveal ***Push an enemy into an electric building in Mechaton's mini-city.(can be obtained in the same chapter as the previous skillshot you will be walking around a toy sized city simply kick an enemy into one of the building shooting off electricty.)
Fish Food -
*** Spoiler - click to reveal ***Feed the fish with an enemy. (Once you progress through the story and find the girl there are plenty of opportunities to kick an enemy into the small pond areas these are full of piranha)
Floater -
Grinder -
*** Spoiler - click to reveal ***Kill an enemy on the big water wheel. (Through story progression you will be at a Dam an see large spinning grinders simple kick an enemy into this to unlock.)
Man Toast -
*** Spoiler - click to reveal ***Kill enemies using the reactors. ( Act 3 Ch 2, when you are chasing down trishka you will enter a room with large reactors,kick a guy into the flames for this to unlock.)
Tenderizer -
*** Spoiler - click to reveal ***Kill an enemy using an elevator. (If you played the demo you will know how to get this skillshot,simply call down the elevator to kill to bunch of skulls coming after you.)** Done in Collasped building same as Ding Dong.
Ding Dong -
*** Spoiler - click to reveal ***Kill an enemy by opening the doors in the "ceiling" in the collapsed building. (again if you played the demo you will know this skillshot, during campaign you will enter a collapsing building and have the opportunity to use your leash to open a door in the ceiling,thus bringing rocks down on unsuspecting enemies.)** Some people are having trouble doing this during the campaign even though they're doing it correct, myself included. I was able to get it first shot when I went back to replay the level in chapter select.** Done in Collasped building same as Tenderizer.
Halloween -
*** Spoiler - click to reveal ***Nom on head, then kick him into an electric object. (available in Act 5 Ch 3 simple put a nom on an enemies head then kick them into one of the advertisement boards.)
Steady Hand -
*** Spoiler - click to reveal ***Only hit the weakspot of a burnout and kill him. (you will meet these guys later on in the game just simply shot the orange weakspots on them to kill them.)
Dino-Sore -
Outburst -
*** Spoiler - click to reveal ***Push an enemy into the storm. (Later on in the game there will be a storm while you are inside, simply kick an enemy out into the electric storm to unlock this skillshot.)
Sucker -
Forced -
*** Spoiler - click to reveal ***Kill an enemy by flinging them into an electromagnetic pulse barrier. ( Act 7 Ch 2 acheived by leashing/kicking a soldier into the laser barrier that appears when you turn on the airlock to release the chambers.)
Ejectulated -
Weed Killer -
Minced Meat -
Grilled Meat -
List supplied by ll Mr Bubbles ll @x360a with how-to amendments by myself to help out.
If you have good suggestions for some of the trickier ones you think might help, comment and I'll amend with a source credit for you.