I am playing Warhammer FRP 2ed with a group with a Gamemaster that did something I dont think he could do. When I created my character, you start with 1 attack. I chose the Trollslayer as a starting career. I accopmlished all the necessaryupgrades to my character and defeated a Giant to advance to a Giant Slayer. So I started with 1 attack, go 1 attack from becoming a Troll Slayer and then got 1 more attack for becoming a Giant Slayer. So, I have 1 attack + 1 attack +1 attack which should equal 3, right? My Gamemaster says I only get two attacks. Which is right, Do I only have 2 attacks for being a Giant Slayer or 3 attacks? Your help will be great apprecaited.

Your GM is right. Advances in 2nd ed. don't stack, so your Giant Slayer has +1 attack over the 1 you started with (the same as Troll Slayer). To get 3 attacks you'll need to get to a career with Attack +2, in your case Daemon Slayer.