Here is the action code to have a shot at pink drops
1.Kill all enemies in all rooms.
2. Disarm all bombs
3. Save hostages
4. No One Can Die
5. Save all six barrels in boss fight
6. You have to do it in 10 min
(this is the only part i am not sure on but i know its a time limit)

If you mess up on any of these action codes you will not see pink
Remember to get a legendary item you have to do legendary things
good luck to all