[Feature Request] Make all the achievements working & Cleanup of the Achievement System

[niklasmoell]

Is your feature request related to a problem? Please describe.
Only one of the 5 achievements shown is achievable at the moment. Additionally: Create a better Achievement System, unify methods (only one achievement giving method that puts the achievement in the database & sends a message to the player)

Describe the solution you'd like
Integrate them.

Describe alternatives you've considered
None

Additional context
None