In the process of adding the archer character, I'm adding achievements to the game. The first one is completing the archer's quest and unlocking the character.
Once we see that this all works nice, there will be more achievements, many not related to character unlocking. I plan for about 50 achievements in the game.
The Archer achievement is publicly visible now for testing. You will be able to unlock it in the next game update, which should be later today or tomorrow.
If you have some cool ideas for achievements, please comment below.