[...] when I check to total sum of all the addresses on block explorer, there are less coins that the in the trezor balance.
Do you recall having a change output in any of your transactions? That could be the cause.
Is there a way to list all the addresses accosted with the wallet and having balance in them?
Yes, the easiest way would be probably to use Electrum for that. However, using a public key for each account might be a better idea than adding every single address to a watchlist manually. As far as I remember, Sentinel supports public keys.
This guide shows how to get public keys for each account on wallet.trezor.io.