Here is the full list of all 16 Who Wants to Be a Millionaire? achievements worth 200 gamerscore.
Play a complete game of "Who Wants To Be A Millionaire?".
Guess the correct order of the 4 answers in a round of Fastest Finger First.
Reach the first safe haven.
Reach the second safe haven.
Answer questions 1 to 7 correctly without using any Lifelines.
Answer questions 8 to 12 correctly without using any Lifelines.
Answer questions 1 to 2 correctly without using any Lifelines.
Answer questions 3 to 7 correctly without using any Lifelines.
Correctly answer a question between 3 and 7 in less than 2 seconds.
Correctly answer a question between 11 and 15 in less than 4 seconds.
Answer the last question correctly.
Answer the last question correctly keeping one unused Lifeline.
You have answered the last question correctly and have two Lifelines left to use.
Answer the last question correctly without using any Lifeline.
Answer the 15 questions correctly in less than 90 seconds.
Answer the 15 questions correctly in less than 60 seconds.