Transaction Account Info
To fetch the Account Information for a transaction, you will need its Public Key. The Public Key can be derived with the underlying Multisig Public Key and the transaction index, which is an incrementing counter keeping track of the number of total transactions.
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Different transaction Types
On Squads V4 there are two kind of transactions, the one you will probably need the most is the vault transaction, used to manage pretty much everything that is not configuration related to your Multisig (Asset management, validator withdraw authority management, program upgrade authority management...). The second one is the config transaction, which is used to manage configurations (spending limits, members, time-locks...) on your Multisig.
Fetch Vault Transaction Info
Fetch Config Transaction Info
For more information on the structure of the different Transaction accounts, head to their reference.