Dishonored is a great game and the loot can be tricky to find. I scoured the (beautiful) areas and still didn't manage to find it all on two playthroughs. Very different game to BL2 obviously, but a great game with loot.
Dishonored doesn't really need that much loot, because the enemy count is far far less, it's a close range stealth game, you can kill everyone with your sword, as such the Ammo is just a nice bonus if you want to vary your tactics.