I managed to do it with Precision Rail Rifle by killing (explosive headshot) Combine soldier. I don't know if there are other guns that work, because this is the only gun that can do explosive headshots.

Ok guess I'll give that a shot. Thanks for the answer!

Edit: Literally first try. Thanks again!

Originally posted by Paranoia_Inc:

Ok so what counts as "a weapon that can headshot"? Cause everytime I've pistoled or rifled or Para'd a head on an enemy in midair, all I've gotten in response are sparks. Which makes for confusing feedback.

weapons that can explode a head on headshot, namely the following:

1. aimed down 357 magnum
2. zoomed in sniper rifle
3. first 5 shots of the AR2's scoped in mode
4. the railgun
5. shotgun's secondary fire
6. aimed down xm1014 shotgun

The railgun is the easiest out of all of these, but as all players have access to the Sniper Rifle as well, it's also the second easiest option to get the achievement.

additional details: it may be easier to do this while an enemy is up against a wall

Originally posted by Bitl:

weapons that can explode a head on headshot, namely the following:

1. aimed down 357 magnum
2. zoomed in sniper rifle
3. first 5 shots of the AR2's scoped in mode
4. the railgun
5. shotgun's secondary fire
6. aimed down xm1014 shotgun

The railgun is the easiest out of all of these, but as all players have access to the Sniper Rifle as well, it's also the second easiest option to get the achievement.

Ok so I tried sniper rifle and 357 magnum already and both didn't work. Gave the aforementioned sparks instead. And yeah tried these before making the thread. Also tried the default Spas shotgun but always looked like it was bodyshots doing kills but now not sure if I bothered with the alt fire.

Originally posted by Paranoia_Inc:

Originally posted by Bitl:

weapons that can explode a head on headshot, namely the following:

1. aimed down 357 magnum
2. zoomed in sniper rifle
3. first 5 shots of the AR2's scoped in mode
4. the railgun
5. shotgun's secondary fire
6. aimed down xm1014 shotgun

The railgun is the easiest out of all of these, but as all players have access to the Sniper Rifle as well, it's also the second easiest option to get the achievement.

Ok so I tried sniper rifle and 357 magnum already and both didn't work. Gave the aforementioned sparks instead. And yeah tried these before making the thread. Also tried the default Spas shotgun but always looked like it was bodyshots doing kills but now not sure if I bothered with the alt fire.

the 357 and sniper have to be aimed down/zoomed and aimed directly at the head. it is possible to get the achievement with those, but it's easier to use the railgun. The shotgun alt fire also has to be aimed directly at the head as well.

none of the weapons should be giving sparks unless low violence is enabled (as in if you're playing FR in german or blood is disabled), i feel like that's why the achievement won't work. If that's the case, enable "Show headshot kills performed by normal weapons as headshots in the kill log." in the options. it will register every head hit as a headshot and will enable the achievement in those scenarios.