The most common causes of this issue are:

A hotfix was applied a day later, so this no longer appears to be earnable early.Your IP address has been temporarily blocked due to a large number of HTTP requests. For about a day after launch this achievement was unlocking after completing only one competition. * Note * People will be seen who earned this very early without having completed 1,000 competitions and before many other achievements. you don't need to win (for this particular achievement), only participate. Travel to the relevant area - also make sure you have the correct fishing license and requisite gear before taking part. You'll get a prompt on screen when it's starting. Press X to apply for the competition and then wait for the competition time. I got lucky when I checked as there was a min level 3 competition due to start within two minutes, but right now they are all out of my level range. They are restricted by level (both min and max), so early on you may find you're not able to join many (or even any at all).

From the 'Schedule' section take a look through the upcoming competitions and see if you are eligible to join any.

Tournaments - This is where you can sign up for the in-game tournaments, which you will need for another achievement.

Competitions - This provides a calendar view of all upcoming challenges and the area they will take place in.

Schedule - this lists all scheduled competitions that are upcoming.

To join a competition open the menu, then press RB to move over to the 'Events' tab. Before you can do this you will need to register for the competition. Competitions run on a timed schedule, so you need to wait until a competition is live in order to take part.

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