Collect all bronze rewards from the indicated level to unlock the corresponding concept art. To unlock the Bronze gallery, in Tomb Trials mode complete all levels in Treasure Hunt mode under the easy difficulty setting. To unlock the silver gallery, in Tomb Trials mode complete all levels in Treasure Hunt mode under the medium difficulty setting. To unlock the Gold gallery, in Tomb Trials mode complete all levels in Treasure Hunt mode under the hard difficulty setting.

Bolivia: All bronze rewards from Bolivia.
England: All bronze rewards from England.
Ghana: All bronze rewards from Ghana.
Japan: All bronze rewards from Japan.
Kazakhstan: All bronze rewards from Kazakhstan.
Nepal: All bronze rewards from Nepal.
Peru: All bronze rewards from Peru.
Special: All bronze rewards from Croft Manor.