Save very often as you progress through the game undetected. If you get spotted, reload the last saved game. Note: If you do not have the Insignia of the Shadow after a few missions, return to them later through the "Replay Mission" menu at your hideout. Note: If attempting a 100% completion, consider doing all the Insignia attempts (stealth, no kill, no alert, speedrun) at the same time. You will need all insignia skill points as well as every objective to get enough points to purchase all the skills. It is easier to kill everything and collect all the tokens during your first run, then complete a full insignia run on the same level immediately following.