Tatooine Datacron Locations

Anchorhead (Republic Only!)
Color Orange
Stat Boost +3 Cunning
Codex Entry Galactic History #39: The Third Great Schism
Map Coordinates 2139, -3673 
Details First, to go to the northwest edge of Anchorhead and look for a sand dune that is almost at the top of the wall. Follow the wall all the way across, which will lead you to rooftops. Then go left(north) along the buildings. You will go across 3 different blue canvases. At the end of the third canvas look down and to your left where there is a dome shaped roof. The Datacron is located right next to it below you. 

Mos Ila (Empire Only!)
Color Orange
Stat Boost +3 Cunning
Codex Entry Galactic History #39: The Third Great Schism 
Map Coordinates 721, 3132 
Details Head to the rocky ledge at 444, 3091.
 Jump on to the large red caonpy and head to the north corner. Drop on to the building and head north-east and jump down to the lower roof. Head noth till you see a wall that runs east to the next building.
Jump across that and head south once you are on the ledge of the dome.
Jump on from the wall, to the exhaust port then the wall. Jump onto the scafolding, then to the pipe on the side of the cat walk, then the catwolk itself.
Cross the catwalk and carefully jump on the railing/ledge to make the jump to the pipe on wall easier.
Then jump to the other vent, then the scafolding.
Cross the wall to the building, and go around (either way works) till you are on the south side mid-point.
Look down and drop on the small wall section between the buildings. Head south and you will find the Datacron on the lower roof, opposite the Mos Ila Market.

Jundland (Eastern Wound) 
Color Purple
Stat Boost +3 Willpower
Codex Entry Galactic History #42, The Nevoota Extinction 
Map Coordinates 2073, -577 
Details First, cross the bridge into the Eastern Wound area and go south west along the ridge along the valley. You're going to be jumping down and in the other direction to find a cave that takes you there. 
There are some large rocks to your right and a small nook at location 2047, -440. Look down, and see the large rock formation jutting out in the valley; it has a flag to signify the entrance.  Note that you will take damage from this fall, so just replenish your health before going on. Jump down and enter the cave. Kill any Sand People in the way and just follow the cave all the way and you will see the Datacron.

Note: You can use your speeder in here (if you have one) and just run past most of the sand people.

Jundland (Transport Ship Crash Site) 
Color Light Green
Stat Boost +3 Aim
Codex Entry Galactic History #38: The Tyrant of Onderon 
Map Coordinates -628, -30 
Details This Datacron is easy to obtain.
If you are Imperial go to Mos Anek, and travel north until you find a large sand ramp to the west which is located at -264, 102.
If you are Republic you can still go though Mos Anek, you just have to use your respawn immunity a few times after the guards kill you, it's sad and annoying but effective.
Go up the ramp and to the back of the area, which is the Transport Ship Crash Site and follow the western edge until you see a cliff with what looks to be part of a broken ship. Look down and carefully jump to each ledge to retrieve the Datacron located on a metal platform.

Instead of dying yourself through Mos Anek as republic, you can simply walk through the open world pvp area.

The Dune Sea  
Color Red & White (Two Datacrons in 1!)
Stat Boost +3 Strength & MATRIX SHARD
Codex Entry Galactic History #<unknown>
Map Coordinates -2391, -1381 
Details These two Datacrons are located in the same area.
First, in the southwest corner of The Dune Sea there is a Jawa Sandcrawler (at -2340,465).
Get on top and wait for a balloon to appear (you will be waiting 1-40 minutes).
Ride this balloon for 30 minutes (make sure you do not go AFK during this).  You will eventually see a Sandcrawler with a glowing Matrix Shard Datacron. Jump down onto the Sandcrawler to obtain the Datacron.
NOTE! You must jump on the side with the Datacron, if you wait too long you will miss your opportunity and have to do the whole run again!  The Balloon does not stop to let you off.

For the Red Datacron go to the edge of the Sandcrawler (the side closest to the Datacron) and carefully jump down to a small platform sticking out of it. There is a small compartment with the Datacron sitting inside. Make sure to jump down to this platform, do not try to edge off, you will miss.