Here is the full list of all 42 New Frontier achievements.
Open 10 Treasure Chests without using a lockpick.
Mine 100 Gold Nuggets.
Discover 15 unique locations.
Travel on foot or horseback 10,000 miles.
Kill 100 Civilians or Deputies.
Kill 100 'Outlaws'.
Deploy 10 Campsites.
Use Lockpicking to open 30 Chests.
Unlock 5 Safehouses.
Achieve level 50.
Complete 10 Quests.
Sell $10,000 worth of gear to the vendor.
Use 10 Treasure Maps.
Consume 100 Alcoholic Beverages.
Upgrade 20 Weapons.
Repair 50 Weapons.
Retrieve 100 Meat or Hides from Animal Traps.
Kill 100 wild animals at Hunting Grounds.
Harvest 200 Gardens.
Consume 100 Magic Dust.
Acquire 50 kills using only explosives.
Open 500 Treasure Chests without using a lockpick.
Discover 25 unique locations.
Discover 100 unique locations.
Mine 10,000 Gold Nuggets.
Kill 1000 Civilians or Deputies.
Kill 5000 Civilians or Deputies.
Kill 1000 'Outlaws'.
Deploy 500 Campsites.
Use Lockpicking to open 500 Chests.
Complete 100 Quests.
Complete 500 Quests.
Use 100 Treasure Maps.
Travel on foot or horseback 1,000 miles.
Travel on foot or horseback 500 miles.
Travel on foot or horseback 250 miles.
Travel on foot or horseback 100 miles.
Mine 5,000 Gold Nuggets.
Mine 2,500 Gold Nuggets.
Mine 1,000 Gold Nuggets.
Mine 500 Gold Nuggets.
Mine 250 Gold Nuggets.