Where do i find my full steam purchase history?

for the dlc part, purchase history is a pain because bundles hide what was inside them. in account details there's also licenses and product key activations, and that lists every single thing on the account, dlc included, even stuff you got from bundles or keys.

Steam client, click your name top right, Account details, then View purchase history. Goes all the way back, refunds and wallet top-ups included.