Here is the full list of all 31 Cabela's Big Game Hunter 2008 achievements worth 1,000 gamerscore.
Crossed the first log without falling.
Complete every single hunt in Career mode (required and optional).
Took down the Rival African Lion without being hit or missing a single shot.
Took down the Trophy Legend Waterbuck in only one shot.
Took down the Rival Wild Boar without being hit.
Took down the Trophy Legend Fallow Deer in only one shot.
Took down the Trophy Legend Red Stag in only one shot.
Hunted 20 small game animals in any season in Career mode with any handgun.
Hunted 10 small game animals in any season in Career mode with the muzzleloader.
Hunted 15 small game animals in any season in Career mode with the crossbow.
Hunted all objective animals without using a firearm scope in any single season.
Took down the Rival African Leopard without being hit more than once.
Took down the Trophy Legend Hartebeest in only one shot.
Took down the Rival Cougar without being hit and without more than three missed shots.
Took down the Trophy Legend Axis Deer in only one shot.
Took down the Trophy Legend Greater Kudu in only one shot.
Took down the Trophy Legend Water Buffalo in only one shot.
Took down the Trophy Legend Rocky Mountain Elk in only one shot.
Took down the Trophy Legend Yukon Moose in only one shot.
Completed an entire season without shooting any animals outside of an objective.
Completed any season in Career mode with over 90% accuracy.
Completed any season in Career mode with over 50% accuracy.
Completed any season in Career mode with over 70% accuracy.
Took down the Rival Grizzly Bear without being hit more than three times.
During any single Rival Animal Hunt, the player dodged at least 10 attacks.
Took down the Trophy Legend Rocky Mountain Mule Deer in only one shot.
Completed the first climb without losing your grip.
First animal was hit over 200 yards.
First animal that was hit between 100 and 150 yards.
First animal was hit between 150 and 200 yards.
First animal was hit over 75 yards with out using a firearm scope.