You'll receive the noisemaker early on just by progressing through the game's main missions. Once you have it, you can toot it by pressing
. You can spam
very quickly if you just want to get the achievement out of the way. After I casually beat the game and only spammed it to get the achievement for tooting it about 100 times, I was at 77%. I spammed
after the end credits until I got it.
This game does a nice job tracking achievement progress, so you can see how far you are into completing this one at any point.