There are total 13 standing stones which can be found scattered throughout Skyrim. You can earn two achievements, first by finding a standing stone and getting its blessing, and second by finding all 13 standing stones.
To get the Standing Stone blessing, just walk up to the stone, activate it, and you will carry over its effect until you overwrite it with the blessing of a different Standing Stone. Below you will find the locations of all these Standing Stones in Elder Scrolls V Skyrim. Visiting them will net you these two achievements.
The Thief, The Mage, and The Warrior Standing Stone Effect and Location. Thief standing stone makes you learn Stealth skills 20% faster. Mage standing stone makes you learn Magic Skills 20% faster. Warrior standing stone makes you learn combat skills 20% faster. You will find these Southwest of Riverwood, below Anise’s Cabin. You shouldn’t miss them as you leave Helgen. Easy to spot, they are.
The Ritual Stone Effect and Location. It allows you to re-animate nearby corpses to fight for you. You will find it in east of Whiterun, south of the river, between Whiterun and Valtheim Towers.
The Atronach Stone Effect and Location. It gives you huge Magicka boost and enables you to absorb spell damage, though you recover it slowly. You will find it between Riften and Windhel, in the marshland. It’s just outside the mountain range between the two locations, near the Eldergleam Sanctuary and Darkwater Crossing by the river to the east of the two.
The Shadow Stone Effect and Location. It lets you become invisible once a day for an extended period. You will find it in South of Riften, in a small mountain before the large mountain range to the south.
The Steed Stone Effect and Location. It increases your carrying capacity without any movement penalty. You will find it on the tip of the highest mountain to the mountain, northwest of Solitude.
The Lady Stone Effect and Location. With the blessing of this stone, you will be able to regenerate health and stamina quickly. You will find it in the lake to the west of Riverwood, in a small island.
The Apprentice Stone Effect and Location. It helps you recover magicka quickly but makes you susceptible to magicka damage. It is south of Solitude, on an island, in a small water marshland.
The Tower Stone Effect and Location. Enables you to automatically open expert or lower locks. You will find it in the middle of Winterhold and Dawnstar, up on a mountain.
The Lover Stone Effect and Location. It helps you improve all your skills faster. You will find it in east of Markarth, about one fifth of the way to Solitude.
The Lord Stone Effect and Location. It will make you resistant to Magicka and Physical damage. You will find it in southwest of Dawnstar, in the mountain range, on the northern peak.
The Serpent Stone Effect and Location. Gives you a ranged paralyzing poison to use once a day. You will find it east of Winterhold, north of Windhelm, in the sea, on a floating Ice Berg.
If you find the missing standing stone, let us know the location in the comments. Meanwhile, if you are confused about any location, ask, and we will try to help you out.