Ok you can get this achievement as soon as you spawn into the game near enough.
So speak with the Flower Major Sweetie, he will explain you need to complete 8/8 quests from small flowers.
From looking at Major Sweetie turn left and drop off edge and head towards to the ramp just before the xp machine and target range there will be a flower quest.
to chat and it will go through using your d pad functions and saving a favourite
As soon as you have learned this and assigned your favourite emoji, all you are now required to do is use the d pad in any direction you choose and selecting with
Or you can use
to use your last/favourite for speed, doing this stops you having to select
on your desired expression.
On the left side of the screen will indicate when you have used an expression.
Rinse and repeat until you have done 25/25, your achievement tracker will go up 4% each time you use if you want to keep an eye on it.
As soon as you have hit 25/25, pop achievement unlocked.