With vanilla Bitcoin Core, there is no efficient way to do this.

I see two options:

a) Slow and very inefficient RPC loop (not recommended)

1. Get the genesis block hash (RPC getblockhash 0)
2. Get the block with all transaction (RPC getblock <hash> 2, 2 stands for verbosity with transaction)
3. Loop through all transactions and all its outputs, call gettxout <txid> <n> (where n is the outputs index)
4. If gettxout returns an object, the output is unspent (UTXO), dump it to a text file

This may take a couple of hours or days (depending on your machine).

b) Fast way by patching Core (0.17.1)

1. Change the code of the function call GetUTXOStats(), apply a text file dump in the utxo set loop (while (pcursor->Valid()) {)
2. Compile
3. Call RPC gettxoutsetinfo and let your added code dump data per UTXO to a file (or similar)