Yeti

The Old Snow Beast; Yeti is one of the Frost Mountains Colossal Titans you'll come across in Titan Souls.

Tips for Beating
The Yeti is really fast. After throwing a few shards of icicles, he'll roll 3 times and then leave his butt exposed for you to shoot at with The Arrow. Unlock the Achievement by shooting him earlier. An easy way to get this achievement is to, after he throws his snowballs, stand at the bottom of the stage and slightly right or left. Dodge his roll and after he hits the wall walk forward a step or two then charge your arrow. You should have more than enough time to aim towards where he's going to land. The moment he lands, fire into his weak spot.

On hard mode, to beat the yeti, ignore his first 2 barrages of snowballs, as they will miss. When he rolls towards you, roll perpendicularly to dodge. Watch the falling icicles, as they will home in on you on the way down. When he makes his third attempt to roll, make sure you are near the wall and when he lands make sure your bow is ready to fire at his butt.