Find the sailors at the southernmost dock of Cysael Harbor trying to put out a fire on their ship. Help them and they will tell you that they are now looking for work, giving you the "The Shipless Sailors" quest.
Get Leandra's Spell from her lab in the High Priest's Office (big blue bubble). It is accessible from the library (which in turn is accessed from a portal after meeting Leandra in the mine). You also will require a Vial of Leandra's Blood, which is guarded by Mangoth in the Immaculate Cathedral. To get the blood, you must have the Book "Necronomicon of Cooking" which is west, relative to giant compass on floor. Once obtained, use Leandra's Spell and the Vial of Leandra's Blood to craft a spell that makes the Death Knights vulnerable.
Get the "A Forge of Souls" quest to repair Icara's soul forge to Leandra.
Encounter the first Star Stone and teleport to the Shelter plane to receive a teleportation pyramid. The second pyramid is in Cysael town, inside the bathroom adjoining Mayor Cecil's residence at coordinates X255, Y205. You can teleport to it by using the first pyramid. Pick it up and drop it into your inventory.
South of the church in eastern Cysael is a wishing well at coordinates X435, Y315 that asks for help in rescuing its twin, which is stranded in the ice region of Hiberheim. This quest cannot be completed until Act II, after you find the alternate path to Hiberheim. Kill King Boreas then talk to one of the statues on the northern wall at coordinates X240, Y255 of that room. After giving it the correct answer, "Lurrean", to its question, the barrier in the western part of the room will be removed. Go past it to enter a treasure-filled area that contains a spell that sends the wishing well back to Cysael. Talk to the original wishing well afterwards to earn the achievement. However, before leaving the treasure room, you can open a chest here that requires the "Forgotten Language of Faery" book purchased from Victoria in Cysael to open. Save the game before opening it to repeatedly use it until a rare item is obtained. Also try wearing the Royal Guardsmen Amulet and standing in center of treasure room (where star stone was found) for several seconds.
Herschel, the tavern keeper in Hunter's Edge, requires another batch of Glen's whiskey brewed to keep the Orcs off his back. Visit the cellar in Glen's house located west of the tavern to find a book that describes how to brew the whiskey with the following steps. Go to the water well on the western side of Hunter's Edge, get the bucket on it, then use it on the well to obtain "Bucket with Water". Go to the farm fields to the southwest and take some "Barley". Go into the Mill next to the well and use the "Barley" on the mill to obtain "Grist". Mix the "Grist" with the "Bucket with Water" to obtain "Wort". Use the "Wort" on the Pot Still in Glen's cellar to obtain a barrel of Spirit. Bring the barrel to Zixzax the imp, in The End of Time to have him age it. Bring the barrel of 30 Year Old Whiskey to Herschel to earn the achievement.
In western Cysael, enter the wrecked house next to the Cysael West portal. There is a trapdoor hidden by a rug. Go downstairs to find a sarcophagus. Drag the lid off of it to release Snorri. Talk to him, and he will give you a challenge to destroy a blue orb within a time limit. Fail his challenge and Snorri will break it himself.
Have the Pet Pal feat, then find Sam the cat in the King Crab Inn. You will learn that he is in love with Maxine, Mayor Cecil's cat, and wants you to play matchmaker. To make Sam more attractive, find his jewel-encrusted collar near Desdemona, at the bottom of the Black Cove dungeon.
Talk to Brandon, who can be found wandering around outside the inn at Silverglen, to get the "The Troll's Bounty" quest. He will ask you to obtain a sample of Tenebrium Ore for him. You can mine it or steal it from the Immaculate camp in the northeast.
After getting the Telekinesis+2 ability, go to Cyseal. Go on the road northwest of the market square. Look for a large beer barrel on stilts behind some wooden barriers and up some steps. Once there, switch to your secondary character and place the barrel in their inventory. The barrel will overburden that character, making them unable to move. Switch back to your main character and leave the secondary character with the barrel. Get into a random encounter outside Cyseal. During combat, open your inventory menu and send the Beer Barrel to your main character. Take the barrel out of your inventory, then use Telekinesis+2 to slam it into your enemies. They should be killed instantly. All enemies from random encounters in the overworld map can be killed by this method.