Similar build to what you see in Jungle, I think it's the best way to play him with how tanky his passive allows him to be.
Tank stance heavily out-stats the non-armour mode, especially when facing a physical opponent due to the phys shield on 2 cast.
Avenging is more damage overall, but if you need CD Jotunn's is a very solid option on Achilles, especially if fights are going well, the executes can open up a bunch of CD resets for prolonged fights.