Hitman HD Pack

This achievement is gained in Silent Assassin after making a kill with the fire axe. The fire axe is found in level 9 the "Basement Killing" chapter. When starting the stage on the same ground level there is a "Fire" room which contains a fire axe and fireman's costume. The exit is in the basement and you could throw it down the laundry chute in the opposite side of the ground floor ("Laundry" room) if you plan on taking it into the elevator when completing/saving the level.

You can kill anyone with the fire axe and discard it. If you plan on keeping the axe to store in your tool shed you can reload a chapter later and kill someone with it for the achievement... though I don't recommend completely discarding it and completing the level/saving because then it won't be in your tool shed if you are attempting to collect all of the melee weapons.

Very easy to obtain!

Just follow the Youtube video; with the fire alarm going off you can basically just run through the whole level with the fire axe equipped if you're in the fireman costume. Use the fire axe to kill the main target instead of the fiber wire.

Achievement pop and Silent Assassin rating to go with it afterwards if you time it right.

Enjoy!

This is not my video, full credit goes to the guy/gal behind the 'HitmanVideoGames' channel on the tube.