Geothermal Valley - 'For My Next Trick...' Achievement

Head for the well in the middle of the village. Hop up onto the tree stump near the blacksmith's forge...

...and turn to face the well.

To swan dive, simultaneously press Forward and Jump, then just after takeoff press LT/Right Mouse to go into a dive.

If you do it correctly, Lara will dive headfirst into the well, rather than jumping in feetfirst, and the achievement should unlock. If you're playing with keyboard and mouse, and Lara won't dive when you use the Right Mouse button, try jumping forward and pressing Dodge (C) instead.

To get out of the well, use your climbing axes to scale the rough wall.