Very easy achievement to get, as long as you stay away from danger, so I advice to go fishing during the night.
Just make sure you are on the Plains of Eidolon when the night starts. You will hear sirens going off to announce the start of it. I personally used this site: https://clockofeidolon.com
to see when the night starts and ends, so I can be there on time.
If you revive yourself, you will not get the achievement, so let somebody revive you if you go down. Falling in the water doesn't count as dying at the moment.