Can I export all of my addresses in a txt file?

[BlackHatCoiner]

I have seen that i can export all of my addresses + private keys at once.

Can I export only the addresses?

[nc50lc]

Yes, open the console and type listaddresses(), then 'copy->paste' the results to a text file.
To show the console, click "View->Show Console".

[AB de Royse777]

Visually it's very easy using Electrum.

Wallet > Private Keys > Export

Give it some time.

Select the type (CSV/json)

Check file location and then export.

You will have addresses and the corresponding keys (Electrum format)

From the CSV file just copy the address column.