Two achievements in this video worth a total of 30 Gamerscore for the two achievements. You unlock I got a Tattoo pretty early in the game and it has to be done to progress so you can't miss it. You're given a choice between two tattoos but with a free ticket you can find in this video you don't have to pay for any of them.
As you progress you'll come to Mallrus Shopping World and that is the location of the last parlor. If the acheivement I'm all Inked Up doesn't unlock then check the locations for all the tattoo parlors at the end of the video. I'll put a list below.
Ink of Rage - Located off O'Flanagan's Alley
Gor'Castle Ink 4 Kidz - Next to Gor'Castle Gift Shop
Murder you Tattoo - Near Piratenbase
Kermie's Creations Tattoo - In the Hermits Refuge Cave where you get Smockulas eye.
The Forbidden Quill - in the Direblade Plaza
7th Level Magic User Tattoo - Located in the Mallrus Shopping World mall