Minimum Requirements
https://news.ubisoft.com/article/Assassins-Creed-Odyssey-PC-Specs-and-System-Requirements-Revealed
It looks like that game is again designed for 30FPS so you will need really good PC to reach 60FPS.
- OS: Windows 7 SP1, Windows 8.1, Windows 10 (64-bit versions only)
- Processor: AMD FX 6300 @ 3.8 GHz, Intel Core i5 2400 @ 3.1 GHz, Ryzen 3 - 1200
- Video: AMD Radeon R9 285 (2GB VRAM with Shader Model 5.0) or NVIDIA GeForce GTX 660
- Memory: 8GB RAM
- Resolution: 720p
- Targeted framerate: 30 FPS
- Video Preset: Low
- Storage: 46GB available hard drive space
- DirectX: DirectX June 2010 Redistributable
- Sound: DirectX 9.0c compatible sound card with latest drivers
- OS: Windows 7 SP1, Windows 8.1, Windows 10 (64-bit versions only)
- Processor: AMD FX-8350 @ 4.0 GHz, Intel Core i7-3770 @ 3.5 GHz, Ryzen 5 - 1400
- Video: AMD Radeon R9 290X (4GB VRAM or more with Shader Model 5.0) or better or NVIDIA GeForce GTX 970 (4GB) – See supported list*
- Memory: 8GB RAM
- Resolution: 1080p
- Targeted framerate: 30 FPS
- Video Preset: High
- Storage: 46GB available hard drive space
- DirectX: DirectX June 2010 Redistributable
- Sound: DirectX 9.0c compatible sound card with latest drivers
- OS: Windows 10 (64-bit versions only)
- Processor: AMD Ryzen 1700X @ 3.8 GHz, Intel Core i7 7700 @ 4.2 GHz
- Video: AMD Vega 64, NVIDIA GeForce GTX 1080 (8GB VRAM with Shader Model 5.0)
- Memory: 16GB RAM
- Resolution: 4K
- Targeted framerate: 30 FPS
- Video Preset: High
- Storage: 46GB available hard drive space
- DirectX: DirectX June 2010 Redistributable
- Sound: DirectX 9.0c compatible sound card with latest drivers
The PC version of Assassin's Creed Odyssey will also include unique features not found in the console versions, such as benchmark tools to test the different graphics settings, and a toggle option for dynamic resolution rendering to uncap the framerate.
https://news.ubisoft.com/article/Assassins-Creed-Odyssey-PC-Specs-and-System-Requirements-Revealed
It looks like that game is again designed for 30FPS so you will need really good PC to reach 60FPS.