Tierney had struggled with injury since arriving from Celtic last summer but has since established himself as one of their most consistent performers.
"It's been the toughest year of my life," he told the club's website. "I've had the injury and a lot of new challenges but you need challenges, you need to be uncomfortable.
"You need to challenge yourself to improve. I worked hard every day and I knew it wasn't going to be easy coming to this massive club full of great players. I knew it was going to be tough coming in and trying to get my place in the team.
"I'm just grateful for every opportunity I get to go on the pitch and give my all. I try to repay the manager's faith by working hard and trying to put in good performances. It's all about the hard work.
"I didn't know what to do [to celebrate the goal] so I just turned around," Tierney added. "I think it was shock! I'll take it. It was a good ball from Auba as well so it was a good day for me personally."