The short answer is "Yes"
Just like linen, cotton, bamboo and other natural fibers, there is going to be some wrinkling. Only synthetic fibers (microfibre, polyester etc) made from sketchy processes are less likely to wrinkle.
Although we are more interested in minimizing facial wrinkles, if you want to minimize wrinkling of your sheets here are a few tips:
1. Fold your sheets immediately after drying. Folded sheets will show less wrinkles, where as sheets bunched up in a washing basket will get very wrinkly.
2. Set your dryer to 'iron' setting, if it has one. This will leave a little bit of moisture in the sheets and then iron straight away. The moisture left in the sheets will make the ironing super simple.
Our amazing Tencel is made with 100% natural fibers in an environmentally loving process. Great for you and mother earth, but they do require a little more care than synthetics.