I've got authorize.net account with test(sandbox) mode enabled.
During development I'm making test transactions.
I tried to log in into my account to see the log of said transactions but it says that no transactions are found.
Is there a way in authorize.net developer tools or inside merchant account(account.authorize.net) to view said test transactions?
You should be testing using a Developers Account. It's just like using test mode in your account but you can see your test transactions and can never accidentally be charged for a transaction.