Curious Expedition 2

This game features "club competitions", weekly competitions between either two of the three, or all three of the explorers clubs. These can range from taming more animals, gathering more treasures, killing more wild animals ect. You are prompted to pick a side, and any progress you make towards the goal, while ALSO having that chosen club being your expeditions sponsor, will add to the weekly total.
Just for clarity, if the goal is to gather artifacts, and you choose Lux Labs, having the royal Avalon Society as your next sponsor will not add a total to any side, and the game even warns you about this.

At the end of the week, rewards are given out for your chosen clubs standings, with a reward for whatever place you land typically being a hat, as well as unlocking the "hatter" location in the Paris main hub. The hat is purely cosmetic, changing what your main explorer wears on their head, and offers no other in game bonuses.

Simply joining any competition, an option you are usually automatically given when one is going on, get rewarded with a hat and put it on, and the achievement will pop.

Happy hunting (>*_*)>