Here is the full list of all 13 Causality achievements.
Complete every level in Causality
Kill the stalker
Complete the fourth level set
Complete the level using only 5 actions
Complete the third level set
Complete the level in 16 segments
Complete the level using only 3 actions
Complete the second level set
Complete the level using only 4 actions
Complete the level in 10 segments
Complete the first set