RUN!
The hardest to ghost is the beginning. I'm not talking about this group of guards in front of you when you start. You can easily turn around and run behind corner before they will turn towards you. The problem is archer in right corridor looking at the window. We need to go through this window, but she see us every time. But there is a solution - on right torch behind window is invisibility potion. So you need to run towards window, lean forward, grab it and quickly use it. To do that I needed to bind lean forward to button closer to my run forward button. Then after few tries I managed to avoid 2nd alert from archer and dropped into water.
Then you are appearing in huge open forest area. Our objective is to get 1000 loot and escape and that's easy to do. There is also bonus objective and optional killing objective. Both are connected to collecting of 3 Rubies. Spider cave is easy. Ape cave has only hard beginning where you need to wait for left ape to turn into completely opposite direction together with right ape looking away. If you see ape walking, then that means it is in search mode.
Frogbeasts cave is impossible to ghost. I can only gather 3 crystals near entrance. But no matter how slow or fast I move behind 1st frog, it just goes into search mode. That's why I need to skip 9 crystals and 1 Ruby from this cave. Therefore bonus and optional objectives can't be triggered and completed.
STATS:
Time: 0:25:25; Loot: 1975/2500
Pockets Picked: 0/0; Locks Picked: 1
Back Stabs: 0; Knock Outs: 0
Damage Dealt: 0; Damage Taken: 0; Healing Taken: 0
Innocents killed: 0; Others killed: 0
Iron Beasts Destroyed: 0; Disabled: 0
Secrets: 2/2
GHOST: CHEMICAL SUCCESS. Used invisibility potion to go through window at the beginning of the mission.
PERFECT GHOST: IMPOSSIBLE. Can't ghost frogbeasts cave, so I skipped 9 crystals.