Tools.

You can't become a technological civilisation without tools. Without tools you can't manipulate your environment. You can't use tools without hands (or a hand-like appendage). You can't have two free hands without standing upright, or being a centaur-like creature which is essentially an upright creature with four limbs still on the floor.

And a 'tool' can be as simple as the leg bone of another animal, using it as a club or a rock to throw at the head of your prey/enemy, or to strike at fruit on a tree that is slightly higher than you are.