There are a total of 15 Criptograma Chests and 30 Criptograma Charts in Far Cry 6. Criptograma Chests get marked on the map as you get near it. To open a Criptograma Chest you will need to find 2 Criptograma Charts nearby, which act as keys to open the chest. On opening the chest you will find a Piece of Armor.
You will find blue markings pointing towards the charts. There is also a wind chime near the chest and charts. You can follow the noise of the wind chime to locate them. This article shows the location of Criptograma Chests & Criptograma Charts in the Sierra Perdida region in El Este.
Sierra Perdida Criptograma Chest 1/2 and Criptograma Charts #14 & #30
The Criptograma Chest is on the jetty in the Barriga Swamps in the Sierra Perdida region in El Este.
Criptograma Chart #14: The first chart is on a hut north of the chest as shown below.
Criptograma Chart #30: This chart is on a hut at the western edge of the swamp as shown below.
Sierra Perdida Criptograma Chest 2/2 and Criptograma Charts #27 & #07
The Criptograma Chest is north of Higado Lake in the Sierra Perdida region in El Este as shown below.
Criptograma Chart #27: The chart is on the wall of a hut south of the lake as shown below.
Criptograma Chart #07: This chart is inside an enclosure northwest of the previous chart. You will have to destroy the door of the enclosure to go inside it.