Here is the full list of all 21 Door3:Insignia achievements.
you have collected the nineteenth rune
you have collected the eighteenth rune
you have collected the seventeenth rune
you have collected the first rune
you have collected the second rune
you have collected the third rune
you have collected the fourth rune
you have collected the fifth rune
you have collected the sixth rune
you have collected the seventh rune
you have collected the eighth rune
you have collected the ninth rune
you have collected the tenth rune
you have collected the eleventh rune
you have collected the twelfth rune
you have collected the thirteenth rune
you have collected the fourteenth rune
you have collected the fifteenth rune
you have collected the sixteenth rune
you solved the king puzzle
You completed the game