Group achievements

1. Player Interaction vs Player Connectivity (Gamification Achievement Systems Tips)
2. Single-Player vs Multiplayer (Player-Centric Gamification Tips)
3. Individual Progress vs Team Progress (Gamification Player Progression Tips)
4. Player Competition vs Player Cooperation (Gamification Achievement Systems Tips)
5. Player Experience (PX) vs Player Interaction (PI) (Gamification Achievement Systems Tips)