\documentclass[12pt,a4paper]{article}
\begin{document}
\begin{table}[ht]
\begin{center}
\caption{All statistics are based on contigs of size $\geq$ 500 bp, unless otherwise noted (e.g., "\# contigs ($\geq$ 0 bp)" and "Total length ($\geq$ 0 bp)" include all contigs).}
\begin{tabular}{|l*{61}{|r}|}
\hline
Assembly & \# contigs ($\geq$ 0 bp) & \# contigs ($\geq$ 1000 bp) & \# contigs ($\geq$ 5000 bp) & \# contigs ($\geq$ 10000 bp) & \# contigs ($\geq$ 25000 bp) & \# contigs ($\geq$ 50000 bp) & Total length ($\geq$ 0 bp) & Total length ($\geq$ 1000 bp) & Total length ($\geq$ 5000 bp) & Total length ($\geq$ 10000 bp) & Total length ($\geq$ 25000 bp) & Total length ($\geq$ 50000 bp) & \# contigs & Largest contig & Total length & Reference length & GC (\%) & Reference GC (\%) & N50 & NG50 & N90 & NG90 & auN & auNG & L50 & LG50 & L90 & LG90 & \# misassemblies & \# misassembled contigs & Misassembled contigs length & \# local misassemblies & \# scaffold gap ext. mis. & \# scaffold gap loc. mis. & \# unaligned mis. contigs & \# unaligned contigs & Unaligned length & Genome fraction (\%) & Duplication ratio & \# N's per 100 kbp & \# mismatches per 100 kbp & \# indels per 100 kbp & \# genomic features & \# operons & \# predicted genes (unique) & \# predicted genes ($\geq$ 0 bp) & \# predicted genes ($\geq$ 300 bp) & \# predicted genes ($\geq$ 1500 bp) & \# predicted genes ($\geq$ 3000 bp) & Largest alignment & Total aligned length & NA50 & NGA50 & NA90 & NGA90 & auNA & auNGA & LA50 & LGA50 & LA90 & LGA90 \\ \hline
contigs\_1 & 3 & 3 & 0 & 0 & 0 & 0 & 6710 & 6710 & 0 & 0 & 0 & 0 & 3 & 3980 & 6710 & 10000 & 51.28 & 52.07 & 3980 & 1610 & 1120 & - & 2934.0 & 1968.7 & 1 & 2 & 3 & - & 1 & 1 & 3980 & 0 & 0 & 0 & 0 & 0 + 0 part & 0 & 67.100 & 1.000 & 0.00 & 0.00 & 0.00 & 5 + 4 part & 1 + 1 part & 7 & 6 + 1 part & 5 + 1 part & 1 + 0 part & 0 + 0 part & 2030 & 6710 & 1950 & 1610 & 1120 & - & 1754.1 & 1177.0 & 2 & 3 & 4 & - \\ \hline
contigs\_2 & 4 & 2 & 0 & 0 & 0 & 0 & 5870 & 5460 & 0 & 0 & 0 & 0 & 2 & 3360 & 5460 & 10000 & 52.44 & 52.07 & 3360 & 2100 & 2100 & - & 2875.4 & 1570.0 & 1 & 2 & 2 & - & 2 & 1 & 3360 & 0 & 0 & 0 & 0 & 0 + 0 part & 0 & 54.600 & 1.000 & 0.00 & 0.00 & 0.00 & 1 + 6 part & 0 + 2 part & 6 & 5 + 1 part & 4 + 1 part & 1 + 0 part & 0 + 0 part & 2100 & 5459 & 1471 & 700 & 700 & - & 1552.2 & 847.5 & 2 & 4 & 4 & - \\ \hline
\end{tabular}
\end{center}
\end{table}
\end{document}