Yes, MOTIVATIONS is a Scrabble word!

Letter values in Scrabble US: M 3, O 1, T 1, I 1, V 4, A 1, T 1, I 1, O 1, N 1, S 1.

Is it a valid word?

MOTIVATIONS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

the psychological feature that arouses an organism to action toward a desired goal; the reason for the action; that which gives purpose and direction to behavior
the condition of being motivated
the act of motivating; providing incentive