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Alderaan datacrons
Aim +4 X: 1106, Y: 78
Presence +3 X: -81, Y: -267
Willpower +3 X: -2508, Y: -427
Strength +4 X: 2191, Y: -2020
Endurance +3 X: 2721, Y: 2496
Balmorra (Empire) datacrons
Strength +2 X: 727, Y: 2033
Aim +2 X: -1017, Y: 1514
Willpower +2 X: 191, Y: -346
Cunning +2 X: 1853, Y: 111
Green Matrix Shard X: -505, Y: 1990
Balmorra (Republic) datacrons
Aim +2 X: 191, Y: -346
Cunning +2 X: -1017, Y: 1514
Presence +2 X: 730, Y: 2030
Endurance +3 X: -485, Y: -233
Willpower +4 X: -779, Y: 2069
Coruscant datacrons
Presence +2 X: 2320, Y: 1055
Yellow Matrix Shard X: 905, Y: 4557
Strength +2 X: -3087, Y: 3030
Endurance +2 X: -3729, Y: 161
Cunning +2 X: 1021, Y: 3967
Dromund Kaas datacrons
Strength +2 X: 855, Y: 643
Presence +2 X: 581, Y: 798
Cunning +2 X: -1219, Y: 209
Yellow Matrix Shard X: -187, Y: 1738
Endurance +2 X: -793, Y: 1450
Hutta datacrons
Aim +2 X: -96, Y: 861
Blue Matrix Shard X: -22, Y: 319
Presence +2 X: 497, Y: -13
Korriban datacrons
Willpower +2 X: 529, Y: 65
Endurance +2 X: 150, Y: 78
Red Matrix Shard X: -55, Y: 379
Nar Shaddaa datacrons
Republic - Aim +3 X: -3362, Y: -3316
Republic - Presence +3 X: 3338, Y: -3287
Cunning +3 X: 1958, Y: 3288
Republic - Strength +3 X: 2156, Y: 3103
Yellow Matrix Shard X: 1702, Y: 3084
Empire - Aim +3 X: -3699, Y: -1692
Empire - Presence +3 X: 2930, Y: 400
Empire - Strength +3 X: 2017, Y: 2441
Ord Mantell datacrons
Red Matrix Shard X: 778, Y: 133
Presence +2 X: -971, Y: 201
Aim +2 X: -660, Y: -561
Taris datacrons
Strength +2 X: 1187, Y: -571
Aim +2 X: -1515, Y: -253
Cunning +2 X: 1047, Y: 454
Willpower + 2 X: -362, Y: -227
Green Matrix Shard X: 1059, Y: 1039
Tatooine datacrons
Republic - Cunning +3 X: 2140, Y: -3671
Willpower +3 X: 2115, Y: -596
Aim +3 X: -628, Y: -30
Blue Matrix Shard X: -2391, Y: -1381
Strength +3 X: -2391, Y: -1381
Empire - Cunning +3 X: 726, Y: 3137
Tython datacrons
Endurance +2 X: -33, Y: -102
Willpower + 2 X: -648, Y: -72
Blue Matrix Shard X: -93, Y: 925
Source: http://www.swtor-spy.com/datacrons/