Add achievements for players to earn on a per-user basis

[thegamecracks]

There should be a list of achievements the player can earn such as:

• Earning 1K and/or 10K BP in a single trip
• Spending a total of 100K BP
• Purchasing a total of 50 vehicles
• Surviving outside of base for two hours without being in a safezone

Each achievement could play a sound, show a HUD element presenting the name of the achievement, and be updated on either the map journal or the statistics board. Achievements would have no benefit and would permanently persist in the player's profile.