When given the objective to cross the area using stealth, it may be tough because of the lighthouse alarm. Crawl in the grass besides the hill behind the cabin. Eventually enemies will appear in front of where you have to cross using stealth. Use the small silenced revolver to kill them. Do not kill them while standing or sitting. Kill them while lying down.
ACHIEVEMENT - HOW TO UNLOCK Sniper Expert (30 points) - Deliver 50 headshots. Sniper Master (60 points) - Deliver 100 headshots. Rookie (10 points) - Finish the game on Easy difficulty. Captain (30 points) - Finish the game on Normal difficulty. General (60 points) - Finish the game on Hard difficulty. Act I (10 points) - Complete Act I. Act II (20 points) - Complete Act II. Act III (30 points) - Complete Act III. Act IV (40 points) - Complete Act IV. Seeker (50 points) - Collect all secrets. You Have to Focus (40 points) - Kill 15 enemies using concentration mode. Through the Wall (30 points) - Shoot an enemy through a wall. Flying Knives (30 points) - Kill 10 enemies with throwing knives. Heavy Fire (30 points) - Kill a total of 30 enemies with Browning gun. One package, Two receivers (40 points) - Kill 2 enemies with one grenade. One shot, Two Kills (50 points) - Kill 2 enemies with one shot. The Protector of Pontoon (60 points) - Kill all enemies attacking your pontoon from the riverside on "Weaken The Regime" level. Close Range (40 points) - Kill 250 people using pistol.(Multiplayer) Hold Your Breath (50 points) - Kill 250 people using sniper rifle.(Multiplayer) Sharpshooter (60 points) - Kill 500 people using sniper rifle.(Multiplayer) Supplier of the Death (90 points) - Kill 2000 people.(Multiplayer) Laurel Wreath (100 points) - Win 50 rounds playing online.(Multiplayer) Fallen Eagle (20 points) - Kill 10 birds. Electrician (20 points) - Shoot 5 cable lines using sniper rifles.