This may solve your problems if you're one of the unlucky few. A solution I found on the internet to solve the problems people are having with this achievement is this - if you have met all of the requirements and it still hasn't unlocked, drop out of the Top 250 on the leaderboard and re-enter it.

The daily leaderboard will obviously be easiest for this, and it will get easier as activity on this game dies down. Get in the Top 250 on the 'Best Players' leaderboard. However, people are still able to unlock this achievement, so just get the requirements and you should be good to go. There is a slight problem with this, as the achievement in question is currently glitched and will not unlock when the requirements are met (get 250,000 total points). For the game to count as 'full', you need to play the full 150 seconds, make at least one snap and not exit the game window at all. This requires you to complete 100 full games. Its not really hard, making 90+ or 100+ words. Some people are unlocking it before the requirements are met, and some people can't unlock it after they've been met. Practice makes a man Perfect I have been playing and really enjoying both these games for quite a long time. Got the one for 50k points on windows, opened up the game on winphone, but it does not pop.

I can't post another solution (and I was going to post one again using a different account, but that would get me in trouble with the mods) so I'll leave my rewritten solution here. Thought that the achievements for points and played games would sync, but this does not work for me.

I deleted my solution to the World Champ achievement because it got downvoted into oblivion by people angry that the achievement was glitching out for them.

Wordament not syncing achievements