Tomb Raider I-III Remastered Starring Lara Croft

Done in TR3. This is for sure the most annoying one to do this in simply because of how tough some enemies are, and some sections with vehicles where you're "expected" to shoot. Also because TR3 in general is just tough.

This is achieved by completing the game only firing pistols. I don't know whether simply getting another gun out will break the achievement, whether firing at nothing voids it, or if you need to actually fire another weapon at an enemy for it to count. Just avoid tempting fate and if you fire another weapon for whatever reason, just load your last save.

Level skip voids the achievement. I'm not sure about the weapon cheat, but it's worthless for your pistol only run anyway so... No reason to do it...

You can pick up other weapons without voiding the achievement, but I recommend to never equip them.

Keep in mind that stages where you'll come across enemies underwater, you will NOT be able to use the harpoon gun. So get through underwater sections with enemies in them quickly and either find ground to shoot them with pistols (backtracking or otherwise), or avoid them as much as possible.

You can kill enemies with vehicles just fine [I]ONLY[/I] by running over them (so running over monkeys with the quadbike is fine, though there's an achievement for not doing so...).

You must NOT shoot from the vehicles, though that doesn't include the Turret/rocket launcher at the end of Crash Site (as you need that to complete the level, but it's been stated that even kills with this turtent don't void the achievement). If you want to be extra sure though, at the end of this stage, you can get another achievement at the same time - "Keep all soldiers alive at crash site" - where the moment you get the Turret outside, quickly fire the rocket at the wall on the back left, then make a dash for the exit before any soldiers have a chance to die. If you miss your shot or a soldier gets killed by a raptor on the way, load your save.

Another vehicle you cannot shoot from is the yellow... underwater thing in Luds Gate. This unfortunately will be the toughest part of this run and makes certain sections of the stage incredibly frustrating.

The general recommended playthrough order for TR3 is to start with Nevada (easy), move to Pacific Islands (normal), then finally London (hard). Even with the change made to Navada's gun loss (where you no longer lose all your ammo/meds) I still recommend you follow that order for your pistol only run, as then by the time you reach Lud's Gate you'll have plenty of medikits to push through these vehicle/underwater sections, whether you're going for all secrets or not.

The achievement will unlock when the Completed Game stats appear after the credits (you can skip them).