On any puzzle, change one of the letters to Q, so that it creates a word. Here's one possible solution.
Page 5, Row 3, Column 10. Go top to bottom:
SPLIT (L->A)
SPAIT (T->L)
SPAIL (I->L)
SPALL (A->I)
SPILL (L->T)
SPILT (P->T)
STILT (L->N)
STINT (T->U)
SUINT (S->Q)
QUINT
Full achievement walkthrough video: