I myself just use 'compare two values', with value one the distance between the player and the object, then check if it is less then a really small number (I use 4 and it will consistently detect, but it may need to be larger if your objects move fast/are large).
And that's it! There is no way my eyes could ever tell that the player is 1-3 pixels off centre, but if it really matters, make the first action 'set player position to object'. So this way, when it gets within 4 pixels, the player will centre itself on the object.