Here is the full list of all 17 Thomas Scott achievements.
Complete the eighteenth level of the game.
Complete the seventeenth level of the game.
Complete the sixteenth level of the game.
Complete the fifteenth level of the game.
Complete the fourteenth level of the game.
Complete the thirteenth level of the game.
Complete the twelfth level of the game.
Complete the eleventh level of the game.
Complete the tenth level of the game.
Complete the ninth level of the game.
Complete the eighth level of the game.
Complete the seventh level of the game.
Complete the sixth level of the game.
Complete the fifth level of the game.
Complete the fourth level of the game.
Complete the third level of the game.
Complete the second level of the game.