Here is the full list of all 18 Phrase Shift achievements.
Complete the 5-Letter Words pack
Complete the Animal pack
500 puzzles completed
Complete the Misc. 2 pack
Complete the Misc. 3 pack
Complete the 6-Letter Words pack
Complete the 7-Letter Words pack
Complete the 4-Letter Words pack
Complete the 8-Letter Words pack
Complete the Food pack
250 puzzles completed
Complete the Science pack
Complete the Misc. 1 pack
Complete the Fashion pack
Complete the Misc. 4 pack
100 puzzles completed
Complete the Movies pack
Complete the 3-Letter Words pack