Start with a square piece of paper.
Fold it horisontally in the middle a valley fold and then fold the corners to the middle.
Unfold the horisontal fold, fold the middle horisontal and vertical lines valley folds and the diagonals - mountain folds.
Using the last folds, make a "water bomb base".
Fold the angle bisector.
Unfold and fold the other one.
Flip and repete the last two steps.
Fold the side edges to the middle.
Using the four valley folds that you just made, create a figure like in the picture.
Flip and repete the last steps.
On both sides, fold a valley fold in the middle.
Repete steps 5-11.
Unfold the "water bomb base".
Fold the upper and the lower corners to the center.
Fold the upper left edge to the horisontal middle line a valley fold.
Fold back by the angle bisector.
Repete for the lower left edge.
And for the right edges, too.
Unfold the last foldings.
Fold a valley fold vertically on the middle.
Fold horisontally on the middle a valley fold.
Fold the corner.
Connect the end of the last folding with the end of the horisontal part of the upper edge, and fold a valley fold.
Insert the last fold inside.
Do the same for the other side.
Unfold the corner and undo the folding you made in step 23.
Insert the result of steps no.26-27 into the paper pocket...
Fold horisontally on the middle.
Fold the edges inside using the foldings from steps 17-20...
Open the middle fold.
Fold horisontally on the top a valley fold.
Fold back a little bit lower.
Fold the edges to the middle creating triangles on the sides...
Fold horisontally on the bottom a valley fold.
Fold back a little bit higher.
Create two small triangles on the sides.
Distance the two edges one from the other an fold in the bottom end.
Fold in the parts that are near the head and the tail.
Flip and fold in the legs.
Fix the shape of the shell of your turtle.