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Earn all Gold stars in all operation missions

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As you play the game you will notice a score counter on the bottom of your screen. Killing enemies and achieving medals increase your score. Each mission has 3 tiers bronze, silver, and gold. The best way to go about getting the highest score in each level is to take it slow and kill everything on the map. Don't take it too slow though, you definitely want to chain your kills quickly together to obtain the best medals like Killionaire and Killing Frenzy. Getting melee kills on lonely enemies scattered around earn you more points than if you just shoot them as you run by them. If you are still having an issue there is a Booster called "Score Booster" in which increases points for kills and medals. For a quick way to grind XP to buy Score Boosters check the Pension Plan achievement.