There are all sorts of achievements you can get in Genshin Impact from cooking dishes to defeating enemies and clearing quests/commissions. Here’s how to get all three achievements and the namecard for the Marksmanship achievement as a reward.
Nothing Special, Just Practice
How to complete: Hit a falcon mid-flight with your bow.
Reward: 5 primogems.
You can find two falcons at Huaguang Stone Forest circling in the air high above the mountains. You can glide over from Mt. Aozang’s waypoint to get to a good spot to hit them on the mountains.

Master Sniper
How to complete: Strike an opponent’s weak point with an Aimed Shot
Reward: 5 Primogems
For this achievement you can aim at a large enemy like a Ruin Guard’s eye and paralyze it.
Der Freischütz
How to complete: Strike an opponent’s weak point from very far away with an Aimed Shot.
Reward: 5 Primogems
Now there’s no range on how far you should be in order to obtain the achievement. I attempted this with a few friends and shooting from a high vantage point gives the best result when hitting large enemies like Ruin Guards or large Hilichurls. If you don’t get it on the first attempt try to aim a little higher since the arrow curves when falling. You won’t do the most damage to it, but at least you’ll be able to earn the achievement.