OANDA doesn't have a one-click connection yet, but its Transaction History export brings across your fills, symbols, and realized P&L in one go. Five steps:
Go to hub.oanda.com (or your region's OANDA trading site) and sign in to the account you trade with.
From the account menu, go to History (sometimes listed under Statements). This is your full record of fills, not just open positions.
Pick a range that covers the trades you want in your journal. The widest range OANDA allows is usually easiest for a first import.
Look for an "Export" or "Download CSV" button on the Transaction History page and save the file.
Head back to Import, drop the file in, and the OANDA format is detected automatically. You'll get a preview before anything is saved.