PGA TOUR 2K21: Secret Achievement Guide (Nananana)

Nananana
Sink 5 putts in a row in the putting practice without mulligans, or using Place Ball.

1. Start a Putting Practice session:

   

2. Change the Putting Practice difficulty settings to have Beginner Swing Difficulty and Unlimited Putt Preview:

   

   

   

3. Once on the green, line up your putts and then use the Putt Preview to view the projected putt line. Keep repeating this until you have the putt lined up:

   

   

4. Repeat this process for five holes in a row and you will unlock the Nananana secret achievement.

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Thanks to r00t for his guide on how to unlock the secret achievement, you can also check the original guide from Steam Community.